Saehing

Yes, I had a similar problem, but it was solved by a banal login and logout from my google account

of pmmp do you provide any reports?

First, check the RakNet protocol versions. At the moment, jraknet supports version 10, as well as all new MCBE. This change happened recently, and should fix your error

this will solve your problem: https://pmmp.readthedocs.io/en/rtfd/faq/connecting/win10localhostcantconnect.html