"A fatal error has occurred this, connection has been terminated" when connecting to server

[MastersOfUs]

Title:

"A fatal error has occurred this, connection has been terminated" when connecting to server​

Launcher Version:

1.4.11​

Modpack:

FTB Infinity​

Modpack Version:

2.1.3​

Log Link:

http://paste.feed-the-beast.com/view/a1fd8ec0​

Details of the issue:

We are a group of 4 friends: me, friend 1, friend 2 and friend 3.

Me and friend 1 can play normally and connect to eachothers servers. Friend 2 and friend 3 get the error "A fatal error has occurred this, connection has been terminated" when connect to both mine and friend 1's server. Sometimes they get "Timed out" as well.

We do not know what the problem is, we have tried updating Java, reinstalling the servers, reinstalling java, reinstalling the FTB client (and deleting C:\FTB + %appdata%\Local\ftblauncher. We have tried disabling the firewall and disabling hamachi, but none of these worked.

I should also note that they are able to see the world and move around for up to 5 seconds before being disconnected.

Any help would be appreciated, thanks in advance ​

 

[krolpompon]

I've got the same problem I made a post on reddit https://www.reddit.com/r/FeedTheBeastCrashes/comments/3vjplc/infinity_213_cant_login_to_server/ but no one answered I tried many different things and I'm just tired,

my friend modded vanilla minecraft and now it works for him but not for me and I don't know what to do anymore.