This is an issue with gethostname and/or WSAAsyncGetHostByName. In your jazz2.log, what host name are you seeing on the line that starts with "NET: WinSock v2.2"? And is there a "NET: netGetHostAddr failed:" message shown before you crash? If so, what is the error message?

I'll be able to at least prevent the crash in the next JJ2+ update (this is only an issue when JJ2 attempts to bind to a specific local IP address as opposed to any available IP address), and you should be able to use this dll in the meanwhile.