When in a pinch, I've done some testing with Microsoft's WcfTestClient. It will build out a barebones gui for you based on the service meta-data. Another option that I've seen recommended often, but never tried myself, is wcfstorm.
I was trying to use 17777 because i'm in the .net wcftestclient, however i can connect to 17778 using wcfstorm client lite. The only problem is when i execute an SDK example command (VBClient) using the wcf storm test client (Calling QueryXml with the 'query' field value of SELECT TOP 1 A.AlertDefID, A.ActiveObject, A.ObjectType FROM Orion.AlertStatus A WHERE A.Acknowledged=0 ORDER BY A.TriggerTimeStamp DESC) I get the following error back from the 17778 service method call.
If I run the command without specifying a username and password manually in wcfstorm client lite I get a 'username/password must be provided' style error - so the service does return results other than 'cannot connect to 0.0.0.0:17777'
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