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see also: Synapse

_matrix._tcp.example.com. 1800 IN	SRV	5 900 8448 example.com.

/home/example/conf/web/nginx.example.com.conf

# This will send any path that starts
# with /_matrix to our Synapse!
 
location /_matrix {
	proxy_pass http://localhost:8008;
}

Yes, if you want your users to be able to use third party identifiers (3PID) to discover each other.

Examples for 3PIDs:

• email address
• phone number
• Facebook account

See the following repositories/tags:

• vector-im/riot-meta

• Erkenntnisse und Erfahrungen rund um Matrix 🇩🇪
• Messenger: Matrix – Das XMPP für Hobby-Admins 🇩🇪

• Client-Server API

there's a federation tester.

If you get this error it could be because you specified an identity server in /.well-known/matrix/client which doesn't provide that functionality (e.g. synapse which is only a home server, not an identity server).