My gut feeling is that the problem is in adapters. I recommend shutting down any internet connection that you're not intending to use specifically for this. For example, if you're on an ethernet connection, shut off the wireless connection. Then double check and make sure the dw.ini file line matches the adapters.txt line for that specific connection. Note that you don't need to specify the IP for this to work. Anyway, one thing that might be happening is that your ini tells DW to look for one adapter, but the connection occurs first on the other.
If that isn't it, double check ports and firewalls both at the individual computers and at their routers.
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