[Serusers] not registering

i have set ser up on suse and it all seems to be working fine itsthe newest version of ser with mysql all tables went in fine i edited the config file and there were no errors i was abel to add users useing the serctl command e.g. serctl add username pass email and it went in fine i checked it with phpmyadmin but when i try and ceonect to my server with the corect username and pass it conects but it dosent register here is the log from express talk 15:27:43 Restarting the SIP Engine so settings take effect. 15:27:50 SIP Private IP is: 192.168.1.3:5060 15:27:50 Unable to auto-detect public IP. Using private IP 15:27:50 SIP Public IP is: 192.168.1.3:5060 15:27:50 SIP Number: admin@192.168.1.3:5060 15:28:30 Server 192.168.1.5 did not respond to register (user admin) 15:28:30 Check server details for that line useing ethereal on the server it shows the request comeing in but the server dosent respond. i dont know if ser keeps any logs andf if they do i have no idea were they are. im sure this is a comman error so it should hopefully be easy to fix. :) thanks