Alger2B2T

i can not join any server with forge 1.12.2. Vanilla works fine. No it is not the server’s problem. No, youtube did not help or google either. It gets stuck on the logging in screen when i try to join a server. And later it returns withthis msg: internal exception: java.io.ioexception: an exisitng connection was forcibly closed by the remote host. the forge is a custom client tho i could join singleplayer worlds tho, please help this problem has been concerning me for months now