Do you use a VPN?
Currently I do, otherwise I am unable to access to this forum.
I had to register with a VPN also because my IP was already banned before I got to know this forum, it says "You are banned for trolling".
I can send you my real IP that is banned (it is not dynamic), I don't know if it's safe to post it there or should I send you a PM.
You probably had another sock puppet which was banned for spamming/trolling.
I recently changed my service provider and probably the person who had this IP before was banned, I also had that problem with another website where my IP was banned as well.