[Serusers] help: I keep getting '483 Too Many Hops'

Hello, I set up ser with user authentication turned on on my home gateway today. I got an dyndns address, which I set SER_DOMAIN to before I set up mysql (with ser_mysql.sh) and added a user. Now, if I try to register (with kphone) using the gateways' name in the internal lan as host part of the SIP url (i.e. ('hostname.localdomain'), everything seems to work fine. However, if I set the host part of the SIP url to the dyndns host name ('hostname.dyndns.org'), I keep getting '483 Too many hops' repsonses. I watched the network traffic on my dialup adapter (using ngrep) and found that there's a loop in the REGISTER requests (the request is coming in and going out in a looping manner several times - with another Via: header being added each time). Can someone explain to me what is going on? Why doesn't the 'if (uri==myself)' line in the default ser.cfg catch the request? How does ser interpret 'myself' if it's listening on several addresses (it detects three on my setup - lo/127.0.0.1, the internal lan address and the dialup address)? I think the problem is the dialup addresses' assigned alias name - it gets assigned the name 'dsl-xxx-xxx-xxx-xxx.arcor-ip.net', but not the dyndns name. In fact, if I attempt to connect with 'dsl-xxx-xxx-xxx-xxx.arcor-ip.net' as host part of the SIP url it works - though the request seems to be routed directly to gateway (no output on the ngrep on the dialup interface). Can I configure ser to use another alias for the dialup address? I tried starting ser with '-l hostname.dyndns.org', but it complains with 'hostname.dyndns.org: not found'... I am really lost now... :-( Any insights are very appreciated... cheers, felix -- PGP-Key: http://belugalounge.net/~felix/Felix%20Schmid.asc