Just a thought...
There are relatively cheap devices that provide a phone interface between the computers called a "ring-down circuit". It acts like the public telephone system when you try to connect like that and may solve your problem.
To connect without a password would open the recieving computer to potential outside hacking if it is connected to any other form of connectivity... are you sure you want to do that?
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BREAKFAST.SYS halted... Cereal port not responding
Experience: Something you don't get until 10 minutes after you needed it.