I've been banging my head against this one for a couple of hours so I thought I'd share my pain and see if anyone has a solution.
I have a process that works in development that's not working in a staging environment. The process uses a client event to request approval and sends email with the resulting status. The destination user and to addresses are specified as K2:mydomainmyaccount. When I run the process it's hung on the mail event.
Running in console mode, I can see the error: No Such Host Is known.
In the Error Profile, I can see:Value cannot be null. Parameter name: address
If I specify the user as myaccount@mydomain.com, the process and email work correctly (albeit not using the preferred email address because K2 doesn't do the AD lookup in the mail event unless the to address contains both a ":" and a "")
My best guess is that there's something not quite right with AD or K2's querying. Does anyone have any ideas on what I should be checking into?