Enigmation

Can you connect to the server with your own EXTERNAL IP? If so then the problems are on their end and not yours, however if you cannot connect through the external IP address then the problem is on your end.

There were tons of conflicting item id's when I tried to install it last time. Which would be the main problem. Taken from the Foresty wiki: There isn't any malicious code related to the technic launcher anymore. (Or at least there shouldn't be).