Tried mp for the first time with Cavalier, but each of us kept getting the 1C error. Have opened ports and added FW exceptions... not sure what else to try. Cavalier says he is able to play with others so it must be something on my end.
Any advice or tips?
Generally speaking, Connection Attempt Fail (1C) is the code when the Host doesn't answer to your request.
Why : probably because the port 21205 isn't opened...
Another cause : the IP address is wrong and your request to connection doesn't hit the host.
It is always a problem to really identify the cause.. but very often, it's a firewall of host which locks the request.
A third tool like
Tunngle or
Hamachi allows to bypass the problem of firewall.
Several Grognards use these tools here.
JMM