diff options
| -rw-r--r-- | synapse/config/repository.py | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/synapse/config/repository.py b/synapse/config/repository.py index 82ff8df59c..656eb7ba6c 100644 --- a/synapse/config/repository.py +++ b/synapse/config/repository.py @@ -88,7 +88,11 @@ class ContentRepositoryConfig(Config): config["url_preview_ip_range_blacklist"] ) else: - raise ConfigError("url_preview_url_blacklist is required") + raise ConfigError( + "For security, you must specify an explicit target IP address " + "blacklist in url_preview_ip_range_blacklist for url previewing " + "to work" + ) if "url_preview_url_blacklist" in config: self.url_preview_url_blacklist = config["url_preview_url_blacklist"] |