[SyncEvolution] syncing only possible in LAN

Hello, I am using syncevolution on Maemo 5 (N900) and Harmattan (N950, in development). I have a Funambol server in my local LAN, which is also accessible via a dyndns domain name (the server has no static IP). Syncing inside my local LAN works well. However, syncing via Internet aborts with failures: CurlTransport Failure: couldn't connect to host But the server/port is reachable. A wget http://epia.selfip.net:8080/funambol/ds from the N900 works fine. In the log files I recognized the following, which I expect as the source of the problem: Source (Remote party): 'http://epia.selfip.net:8080/funambol/ds' Response to be sent to URI='http://epia:8080/funambol/ds;jsessionid=... Thus, the response is not sent to the full qualified host name but only to the server name "epia". This works fine within the local LAN but does not work via Internet connection. Where does this RespURI come from? Is the syncevolution client configured wrongly? Or is the server somehow setup wrong (same problem on N900 and N950...)? Thanks a lot for your ideas, regards, Roman