El Foro

Hi all, hope someone can help.
I've been running SimSig on POM for a while now, and it's been running fine. However, about a week ago, I tried to load POM, and it throws the error "Unable to reserve a valid port"
I've looked into port settings, firewall settings, the whole kit and kerboodle, but nothing is turning up. Couldn't find anything on here either.
Would someone be able to assist? It would be gladly appreciated.

Northern