Help with SIP Registration

Hi, I'm still struggling as a newbie FreePBX user to get mine up and running. So far in've installed the box, configured the network and registered my extensions and can make extn -> extn calls. I've been trying to register my Sipgate Trunk to no avail, I've used the settings provided by many on this forum but non seem to work. In desperation I tried a Voiptalk trunk which registered fine, however I cant make any incoming calls to my Voiptalk trunk so something isn't right. I've managed to ssh into my FreePBX box and use the CLI command feature. When I configure/reconfigure my Sipgate trunk I see the following errors: [2013-09-09 14:33:38] ERROR[1786]: netsock2.c:269 ast_sockaddr_resolve: getaddrinfo("http", "//", ...): Servname not supported for ai_socktype [2013-09-09 14:33:38] WARNING[1786]: chan_sip.c:29184 reload_config: Invalid address for externhost keyword: Note: I've substituted my real Dydns address with name just for this post. Does anyone know why FreePBX thinks my address is not correct and copuld this be why registrsation is failing?

Somehow I have managed to get this working now, sorry for taking up bandwidth here.