How to discover login errors from BeejiveIM

I have Openfire 3.9.1, installed on CentOS (Java Version: 1.7.0_51 Oracle Corporation – Java HotSpot™ Server VM).

Miranda IM (Windows 7 Pro) works fine.

BeejiveIM (and IM+) from iPhone can’t connect to server.

I can’t find what I have to setup in order to view connection errors in server logs (debug.log, error.log, info.log, warn.log).

Could you explain me how to find the problem!