[jdev] Re: Ports to use in s2s

[Stephen Marquard]

Gaston Dombiak wrote:
> Hey all,
> 
> The RFC3920 says that  "The RECOMMENDED port for connections between servers 
> is 5269". Should the same port (eg. 5269) be used for TLS s2s communication 
> and Server Dialback? 

Yes, because TLS negotiation takes place after the initial s2s stream is 
established.

> When doing Server Dialback, which port should the 
> Receiving Server connect to for establishing a connection to the 
> Authoritative Server?

The same port it would use for initiating a connection, which could be 
5269 but could be something else defined in an _xmpp-server._tcp dns SRV 
record. An existing connection can also be used for dialback.

Regards
Stephen