Bamboo claims it will look up the service record for instant messaging if you leave the port blank:

"If no port is specified, Bamboo will first perform a DNS SRV lookup or use the default port."

However, if you specify "Requires an TLS/SSL connection" then it will not look up the service record and will use port 5222/5223 and the specified host name instead.

This seems to be a very longstanding bug.

Workarounds (not good workarounds):

• Don't specify requiring a secure connection (a secure connection should still be used if available)
• Don't use DNS SRV lookup and instead specify the direct host and portname.