summary refs log tree commit diff
path: root/develop/turn-howto.html
diff options
context:
space:
mode:
authoranoadragon453 <anoadragon453@users.noreply.github.com>2021-06-03 16:21:02 +0000
committeranoadragon453 <anoadragon453@users.noreply.github.com>2021-06-03 16:21:02 +0000
commit5b98526363a34c5c94d4ede0e8c44d262c085b78 (patch)
treec8e846299a0c82d24bd920a27fdfd147fa8a3a6c /develop/turn-howto.html
parentSet up gh-pages branch (diff)
downloadsynapse-5b98526363a34c5c94d4ede0e8c44d262c085b78.tar.xz
deploy: fd9856e4a98fb3fa9c139317b0a3b79f22aff1c7
Diffstat (limited to 'develop/turn-howto.html')
-rw-r--r--develop/turn-howto.html521
1 files changed, 521 insertions, 0 deletions
diff --git a/develop/turn-howto.html b/develop/turn-howto.html
new file mode 100644
index 0000000000..71483aca27
--- /dev/null
+++ b/develop/turn-howto.html
@@ -0,0 +1,521 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Configuring a Turn Server - Synapse</title>
+        
+        
+
+
+        <!-- Custom HTML head -->
+        
+
+
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        
+        <link rel="icon" href="favicon.svg">
+        
+        
+        <link rel="shortcut icon" href="favicon.png">
+        
+        <link rel="stylesheet" href="css/variables.css">
+        <link rel="stylesheet" href="css/general.css">
+        <link rel="stylesheet" href="css/chrome.css">
+        
+        <link rel="stylesheet" href="css/print.css" media="print">
+        
+
+        <!-- Fonts -->
+        <link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
+        
+        <link rel="stylesheet" href="fonts/fonts.css">
+        
+
+        <!-- Highlight.js Stylesheets -->
+        <link rel="stylesheet" href="highlight.css">
+        <link rel="stylesheet" href="tomorrow-night.css">
+        <link rel="stylesheet" href="ayu-highlight.css">
+
+        <!-- Custom theme stylesheets -->
+        
+        <link rel="stylesheet" href="docs/website_files/table-of-contents.css">
+        
+        <link rel="stylesheet" href="docs/website_files/remove-nav-buttons.css">
+        
+        <link rel="stylesheet" href="docs/website_files/indent-section-headers.css">
+        
+
+        
+    </head>
+    <body>
+        <!-- Provide site root to javascript -->
+        <script type="text/javascript">
+            var path_to_root = "";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
+        </script>
+
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script type="text/javascript">
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script type="text/javascript">
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            var html = document.querySelector('html');
+            html.classList.remove('no-js')
+            html.classList.remove('light')
+            html.classList.add(theme);
+            html.classList.add('js');
+        </script>
+
+        <!-- Hide / unhide sidebar before it is displayed -->
+        <script type="text/javascript">
+            var html = document.querySelector('html');
+            var sidebar = 'hidden';
+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
+            }
+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html" class="active">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrading/index.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded "><a href="MSC1711_certificates_FAQ.html">Upgrading from pre-Synapse 1.0</a></li><li class="chapter-item expanded affix "><li class="part-title">Usage</li><li class="chapter-item expanded "><a href="federate.html">Federation</a></li><li class="chapter-item expanded "><a href="usage/configuration/index.html">Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/configuration/homeserver_sample_config.html">Homeserver Sample Config File</a></li><li class="chapter-item expanded "><a href="usage/configuration/logging_sample_config.html">Logging Sample Config File</a></li><li class="chapter-item expanded "><a href="structured_logging.html">Structured Logging</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/index.html">User Authentication</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single-Sign On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><div>SAML</div></li><li class="chapter-item expanded "><div>CAS</div></li><li class="chapter-item expanded "><a href="sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="jwt.html">JSON Web Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><div>Pluggable Modules</div></li><li><ol class="section"><li class="chapter-item expanded "><div>Third Party Rules</div></li><li class="chapter-item expanded "><a href="spam_checker.html">Spam Checker</a></li><li class="chapter-item expanded "><a href="presence_router_module.html">Presence Router</a></li><li class="chapter-item expanded "><div>Media Storage Providers</div></li></ol></li><li class="chapter-item expanded "><a href="workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="admin_api/delete_group.html">Delete Group</a></li><li class="chapter-item expanded "><a href="admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="admin_api/purge_room.html">Purge Rooms</a></li><li class="chapter-item expanded "><a href="admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="admin_api/shutdown_room.html">Shutdown Room</a></li><li class="chapter-item expanded "><a href="admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="admin_api/version_api.html">Server Version</a></li></ol></li><li class="chapter-item expanded "><a href="manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="dev/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li class="chapter-item expanded "><a href="opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="dev/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="dev/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li></ol>
+            </div>
+            <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
+        </nav>
+
+        <div id="page-wrapper" class="page-wrapper">
+
+            <div class="page">
+                
+                <div id="menu-bar-hover-placeholder"></div>
+                <div id="menu-bar" class="menu-bar sticky bordered">
+                    <div class="left-buttons">
+                        <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
+                            <i class="fa fa-bars"></i>
+                        </button>
+                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
+                            <i class="fa fa-paint-brush"></i>
+                        </button>
+                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
+                            <li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
+                        </ul>
+                        
+                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
+                            <i class="fa fa-search"></i>
+                        </button>
+                        
+                    </div>
+
+                    <h1 class="menu-title">Synapse</h1>
+
+                    <div class="right-buttons">
+                        
+                        <a href="print.html" title="Print this book" aria-label="Print this book">
+                            <i id="print-button" class="fa fa-print"></i>
+                        </a>
+                        
+                        
+                        <a href="https://github.com/matrix-org/synapse" title="Git repository" aria-label="Git repository">
+                            <i id="git-repository-button" class="fa fa-github"></i>
+                        </a>
+                        
+                        
+                        <a href="https://github.com/matrix-org/synapse/edit/develop/docs/turn-howto.md" title="Suggest an edit" aria-label="Suggest an edit">
+                            <i id="git-edit-button" class="fa fa-edit"></i>
+                        </a>
+                        
+
+                    </div>
+                </div>
+
+                
+                <div id="search-wrapper" class="hidden">
+                    <form id="searchbar-outer" class="searchbar-outer">
+                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
+                    </form>
+                    <div id="searchresults-outer" class="searchresults-outer hidden">
+                        <div id="searchresults-header" class="searchresults-header"></div>
+                        <ul id="searchresults">
+                        </ul>
+                    </div>
+                </div>
+                
+
+                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
+                <script type="text/javascript">
+                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
+                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
+                    });
+                </script>
+
+                <div id="content" class="content">
+                    <main>
+                        <!-- Page table of contents -->
+                        <div class="sidetoc">
+                            <nav class="pagetoc"></nav>
+                        </div>
+
+                        <h1 id="overview"><a class="header" href="#overview">Overview</a></h1>
+<p>This document explains how to enable VoIP relaying on your Home Server with
+TURN.</p>
+<p>The synapse Matrix Home Server supports integration with TURN server via the
+<a href="http://tools.ietf.org/html/draft-uberti-behave-turn-rest-00">TURN server REST API</a>. This
+allows the Home Server to generate credentials that are valid for use on the
+TURN server through the use of a secret shared between the Home Server and the
+TURN server.</p>
+<p>The following sections describe how to install <a href="https://github.com/coturn/coturn">coturn</a> (which implements the TURN REST API) and integrate it with synapse.</p>
+<h2 id="requirements"><a class="header" href="#requirements">Requirements</a></h2>
+<p>For TURN relaying with <code>coturn</code> to work, it must be hosted on a server/endpoint with a public IP.</p>
+<p>Hosting TURN behind a NAT (even with appropriate port forwarding) is known to cause issues
+and to often not work.</p>
+<h2 id="coturn-setup"><a class="header" href="#coturn-setup"><code>coturn</code> setup</a></h2>
+<h3 id="initial-installation"><a class="header" href="#initial-installation">Initial installation</a></h3>
+<p>The TURN daemon <code>coturn</code> is available from a variety of sources such as native package managers, or installation from source.</p>
+<h4 id="debian-installation"><a class="header" href="#debian-installation">Debian installation</a></h4>
+<p>Just install the debian package:</p>
+<pre><code class="language-sh">apt install coturn
+</code></pre>
+<p>This will install and start a systemd service called <code>coturn</code>.</p>
+<h4 id="source-installation"><a class="header" href="#source-installation">Source installation</a></h4>
+<ol>
+<li>
+<p>Download the <a href="https://github.com/coturn/coturn/releases/latest">latest release</a> from github.  Unpack it and <code>cd</code> into the directory.</p>
+</li>
+<li>
+<p>Configure it:</p>
+<pre><code>./configure
+</code></pre>
+<p>You may need to install <code>libevent2</code>: if so, you should do so in
+the way recommended by your operating system. You can ignore
+warnings about lack of database support: a database is unnecessary
+for this purpose.</p>
+</li>
+<li>
+<p>Build and install it:</p>
+<pre><code>make
+make install
+</code></pre>
+</li>
+</ol>
+<h3 id="configuration"><a class="header" href="#configuration">Configuration</a></h3>
+<ol>
+<li>
+<p>Create or edit the config file in <code>/etc/turnserver.conf</code>. The relevant
+lines, with example values, are:</p>
+<pre><code>use-auth-secret
+static-auth-secret=[your secret key here]
+realm=turn.myserver.org
+</code></pre>
+<p>See <code>turnserver.conf</code> for explanations of the options. One way to generate
+the <code>static-auth-secret</code> is with <code>pwgen</code>:</p>
+<pre><code>pwgen -s 64 1
+</code></pre>
+<p>A <code>realm</code> must be specified, but its value is somewhat arbitrary. (It is
+sent to clients as part of the authentication flow.) It is conventional to
+set it to be your server name.</p>
+</li>
+<li>
+<p>You will most likely want to configure coturn to write logs somewhere. The
+easiest way is normally to send them to the syslog:</p>
+<pre><code>syslog
+</code></pre>
+<p>(in which case, the logs will be available via <code>journalctl -u coturn</code> on a
+systemd system). Alternatively, coturn can be configured to write to a
+logfile - check the example config file supplied with coturn.</p>
+</li>
+<li>
+<p>Consider your security settings. TURN lets users request a relay which will
+connect to arbitrary IP addresses and ports. The following configuration is
+suggested as a minimum starting point:</p>
+<pre><code># VoIP traffic is all UDP. There is no reason to let users connect to arbitrary TCP endpoints via the relay.
+no-tcp-relay
+
+# don't let the relay ever try to connect to private IP address ranges within your network (if any)
+# given the turn server is likely behind your firewall, remember to include any privileged public IPs too.
+denied-peer-ip=10.0.0.0-10.255.255.255
+denied-peer-ip=192.168.0.0-192.168.255.255
+denied-peer-ip=172.16.0.0-172.31.255.255
+
+# special case the turn server itself so that client-&gt;TURN-&gt;TURN-&gt;client flows work
+allowed-peer-ip=10.0.0.1
+
+# consider whether you want to limit the quota of relayed streams per user (or total) to avoid risk of DoS.
+user-quota=12 # 4 streams per video call, so 12 streams = 3 simultaneous relayed calls per user.
+total-quota=1200
+</code></pre>
+</li>
+<li>
+<p>Also consider supporting TLS/DTLS. To do this, add the following settings
+to <code>turnserver.conf</code>:</p>
+<pre><code># TLS certificates, including intermediate certs.
+# For Let's Encrypt certificates, use `fullchain.pem` here.
+cert=/path/to/fullchain.pem
+
+# TLS private key file
+pkey=/path/to/privkey.pem
+</code></pre>
+<p>In this case, replace the <code>turn:</code> schemes in the <code>turn_uri</code> settings below
+with <code>turns:</code>.</p>
+<p>We recommend that you only try to set up TLS/DTLS once you have set up a
+basic installation and got it working.</p>
+</li>
+<li>
+<p>Ensure your firewall allows traffic into the TURN server on the ports
+you've configured it to listen on (By default: 3478 and 5349 for TURN
+traffic (remember to allow both TCP and UDP traffic), and ports 49152-65535
+for the UDP relay.)</p>
+</li>
+<li>
+<p>We do not recommend running a TURN server behind NAT, and are not aware of
+anyone doing so successfully.</p>
+<p>If you want to try it anyway, you will at least need to tell coturn its
+external IP address:</p>
+<pre><code>external-ip=192.88.99.1
+</code></pre>
+<p>... and your NAT gateway must forward all of the relayed ports directly
+(eg, port 56789 on the external IP must be always be forwarded to port
+56789 on the internal IP).</p>
+<p>If you get this working, let us know!</p>
+</li>
+<li>
+<p>(Re)start the turn server:</p>
+<ul>
+<li>
+<p>If you used the Debian package (or have set up a systemd unit yourself):</p>
+<pre><code class="language-sh">systemctl restart coturn
+</code></pre>
+</li>
+<li>
+<p>If you installed from source:</p>
+<pre><code class="language-sh">bin/turnserver -o
+</code></pre>
+</li>
+</ul>
+</li>
+</ol>
+<h2 id="synapse-setup"><a class="header" href="#synapse-setup">Synapse setup</a></h2>
+<p>Your home server configuration file needs the following extra keys:</p>
+<ol>
+<li>&quot;<code>turn_uris</code>&quot;: This needs to be a yaml list of public-facing URIs
+for your TURN server to be given out to your clients. Add separate
+entries for each transport your TURN server supports.</li>
+<li>&quot;<code>turn_shared_secret</code>&quot;: This is the secret shared between your
+Home server and your TURN server, so you should set it to the same
+string you used in turnserver.conf.</li>
+<li>&quot;<code>turn_user_lifetime</code>&quot;: This is the amount of time credentials
+generated by your Home Server are valid for (in milliseconds).
+Shorter times offer less potential for abuse at the expense of
+increased traffic between web clients and your home server to
+refresh credentials. The TURN REST API specification recommends
+one day (86400000).</li>
+<li>&quot;<code>turn_allow_guests</code>&quot;: Whether to allow guest users to use the
+TURN server. This is enabled by default, as otherwise VoIP will
+not work reliably for guests. However, it does introduce a
+security risk as it lets guests connect to arbitrary endpoints
+without having gone through a CAPTCHA or similar to register a
+real account.</li>
+</ol>
+<p>As an example, here is the relevant section of the config file for <code>matrix.org</code>. The
+<code>turn_uris</code> are appropriate for TURN servers listening on the default ports, with no TLS.</p>
+<pre><code>turn_uris: [ &quot;turn:turn.matrix.org?transport=udp&quot;, &quot;turn:turn.matrix.org?transport=tcp&quot; ]
+turn_shared_secret: &quot;n0t4ctuAllymatr1Xd0TorgSshar3d5ecret4obvIousreAsons&quot;
+turn_user_lifetime: 86400000
+turn_allow_guests: True
+</code></pre>
+<p>After updating the homeserver configuration, you must restart synapse:</p>
+<ul>
+<li>If you use synctl:
+<pre><code class="language-sh">cd /where/you/run/synapse
+./synctl restart
+</code></pre>
+</li>
+<li>If you use systemd:
+<pre><code>systemctl restart matrix-synapse.service
+</code></pre>
+</li>
+</ul>
+<p>... and then reload any clients (or wait an hour for them to refresh their
+settings).</p>
+<h2 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h2>
+<p>The normal symptoms of a misconfigured TURN server are that calls between
+devices on different networks ring, but get stuck at &quot;call
+connecting&quot;. Unfortunately, troubleshooting this can be tricky.</p>
+<p>Here are a few things to try:</p>
+<ul>
+<li>
+<p>Check that your TURN server is not behind NAT. As above, we're not aware of
+anyone who has successfully set this up.</p>
+</li>
+<li>
+<p>Check that you have opened your firewall to allow TCP and UDP traffic to the
+TURN ports (normally 3478 and 5479).</p>
+</li>
+<li>
+<p>Check that you have opened your firewall to allow UDP traffic to the UDP
+relay ports (49152-65535 by default).</p>
+</li>
+<li>
+<p>Some WebRTC implementations (notably, that of Google Chrome) appear to get
+confused by TURN servers which are reachable over IPv6 (this appears to be
+an unexpected side-effect of its handling of multiple IP addresses as
+defined by
+<a href="https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-12"><code>draft-ietf-rtcweb-ip-handling</code></a>).</p>
+<p>Try removing any AAAA records for your TURN server, so that it is only
+reachable over IPv4.</p>
+</li>
+<li>
+<p>Enable more verbose logging in coturn via the <code>verbose</code> setting:</p>
+<pre><code>verbose
+</code></pre>
+<p>... and then see if there are any clues in its logs.</p>
+</li>
+<li>
+<p>If you are using a browser-based client under Chrome, check
+<code>chrome://webrtc-internals/</code> for insights into the internals of the
+negotiation. On Firefox, check the &quot;Connection Log&quot; on <code>about:webrtc</code>.</p>
+<p>(Understanding the output is beyond the scope of this document!)</p>
+</li>
+<li>
+<p>You can test your Matrix homeserver TURN setup with https://test.voip.librepush.net/.
+Note that this test is not fully reliable yet, so don't be discouraged if
+the test fails.
+<a href="https://github.com/matrix-org/voip-tester">Here</a> is the github repo of the
+source of the tester, where you can file bug reports.</p>
+</li>
+<li>
+<p>There is a WebRTC test tool at
+https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/. To
+use it, you will need a username/password for your TURN server. You can
+either:</p>
+<ul>
+<li>
+<p>look for the <code>GET /_matrix/client/r0/voip/turnServer</code> request made by a
+matrix client to your homeserver in your browser's network inspector. In
+the response you should see <code>username</code> and <code>password</code>. Or:</p>
+</li>
+<li>
+<p>Use the following shell commands:</p>
+<pre><code class="language-sh">secret=staticAuthSecretHere
+
+u=$((`date +%s` + 3600)):test
+p=$(echo -n $u | openssl dgst -hmac $secret -sha1 -binary | base64)
+echo -e &quot;username: $u\npassword: $p&quot;
+</code></pre>
+<p>Or:</p>
+</li>
+<li>
+<p>Temporarily configure coturn to accept a static username/password. To do
+this, comment out <code>use-auth-secret</code> and <code>static-auth-secret</code> and add the
+following:</p>
+<pre><code>lt-cred-mech
+user=username:password
+</code></pre>
+<p><strong>Note</strong>: these settings will not take effect unless <code>use-auth-secret</code>
+and <code>static-auth-secret</code> are disabled.</p>
+<p>Restart coturn after changing the configuration file.</p>
+<p>Remember to restore the original settings to go back to testing with
+Matrix clients!</p>
+</li>
+</ul>
+<p>If the TURN server is working correctly, you should see at least one <code>relay</code>
+entry in the results.</p>
+</li>
+</ul>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
+                        
+                            <a rel="prev" href="reverse_proxy.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                                <i class="fa fa-angle-left"></i>
+                            </a>
+                        
+
+                        
+                            <a rel="next" href="delegate.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                                <i class="fa fa-angle-right"></i>
+                            </a>
+                        
+
+                        <div style="clear: both"></div>
+                    </nav>
+                </div>
+            </div>
+
+            <nav class="nav-wide-wrapper" aria-label="Page navigation">
+                
+                    <a rel="prev" href="reverse_proxy.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                        <i class="fa fa-angle-left"></i>
+                    </a>
+                
+
+                
+                    <a rel="next" href="delegate.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                        <i class="fa fa-angle-right"></i>
+                    </a>
+                
+            </nav>
+
+        </div>
+
+        
+
+        
+
+        
+
+        
+        <script type="text/javascript">
+            window.playground_copyable = true;
+        </script>
+        
+
+        
+
+        
+        <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="searcher.js" type="text/javascript" charset="utf-8"></script>
+        
+
+        <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script>
+        <script src="highlight.js" type="text/javascript" charset="utf-8"></script>
+        <script src="book.js" type="text/javascript" charset="utf-8"></script>
+
+        <!-- Custom JS scripts -->
+        
+        <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script>
+        
+
+        
+
+    </body>
+</html>
\ No newline at end of file