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- <h1 id="setting-up-federation"><a class="header" href="#setting-up-federation">Setting up federation</a></h1>
-<p>Federation is the process by which users on different servers can participate
-in the same room. For this to work, those other servers must be able to contact
-yours to send messages.</p>
-<p>The <code>server_name</code> configured in the Synapse configuration file (often
-<code>homeserver.yaml</code>) defines how resources (users, rooms, etc.) will be
-identified (eg: <code>@user:example.com</code>, <code>#room:example.com</code>). By default,
-it is also the domain that other servers will use to try to reach your
-server (via port 8448). This is easy to set up and will work provided
-you set the <code>server_name</code> to match your machine's public DNS hostname.</p>
-<p>For this default configuration to work, you will need to listen for TLS
-connections on port 8448. The preferred way to do that is by using a
-reverse proxy: see <a href="reverse_proxy.html">the reverse proxy documentation</a> for instructions
-on how to correctly set one up.</p>
-<p>In some cases you might not want to run Synapse on the machine that has
-the <code>server_name</code> as its public DNS hostname, or you might want federation
-traffic to use a different port than 8448. For example, you might want to
-have your user names look like <code>@user:example.com</code>, but you want to run
-Synapse on <code>synapse.example.com</code> on port 443. This can be done using
-delegation, which allows an admin to control where federation traffic should
-be sent. See <a href="delegate.html">the delegation documentation</a> for instructions on how to set this up.</p>
-<p>Once federation has been configured, you should be able to join a room over
-federation. A good place to start is <code>#synapse:matrix.org</code> - a room for
-Synapse admins.</p>
-<h2 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h2>
-<p>You can use the <a href="https://matrix.org/federationtester">federation tester</a>
-to check if your homeserver is configured correctly. Alternatively try the
-<a href="https://matrix.org/federationtester/api/report?server_name=DOMAIN">JSON API used by the federation tester</a>.
-Note that you'll have to modify this URL to replace <code>DOMAIN</code> with your
-<code>server_name</code>. Hitting the API directly provides extra detail.</p>
-<p>The typical failure mode for federation is that when the server tries to join
-a room, it is rejected with "401: Unauthorized". Generally this means that other
-servers in the room could not access yours. (Joining a room over federation is
-a complicated dance which requires connections in both directions).</p>
-<p>Another common problem is that people on other servers can't join rooms that
-you invite them to. This can be caused by an incorrectly-configured reverse
-proxy: see <a href="reverse_proxy.html">the reverse proxy documentation</a> for instructions on how
-to correctly configure a reverse proxy.</p>
-<h3 id="known-issues"><a class="header" href="#known-issues">Known issues</a></h3>
-<p><strong>HTTP <code>308 Permanent Redirect</code> redirects are not followed</strong>: Due to missing features
-in the HTTP library used by Synapse, 308 redirects are currently not followed by
-federating servers, which can cause <code>M_UNKNOWN</code> or <code>401 Unauthorized</code> errors. This
-may affect users who are redirecting apex-to-www (e.g. <code>example.com</code> -> <code>www.example.com</code>),
-and especially users of the Kubernetes <em>Nginx Ingress</em> module, which uses 308 redirect
-codes by default. For those Kubernetes users, <a href="https://stackoverflow.com/a/52617528/5096871">this Stackoverflow post</a>
-might be helpful. For other users, switching to a <code>301 Moved Permanently</code> code may be
-an option. 308 redirect codes will be supported properly in a future
-release of Synapse.</p>
-<h2 id="running-a-demo-federation-of-synapses"><a class="header" href="#running-a-demo-federation-of-synapses">Running a demo federation of Synapses</a></h2>
-<p>If you want to get up and running quickly with a trio of homeservers in a
-private federation, there is a script in the <code>demo</code> directory. This is mainly
-useful just for development purposes. See <a href="https://github.com/matrix-org/synapse/tree/develop/demo/">demo/README</a>.</p>
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