internal exception java.io.ioexception

I have connection problems. I and my friends are playing on a realm, everyone is able to connect perfectly, but I am not. Almost every time I log into the server I get almost instantly kicked by internal exception java.io.ioexception (after 10-30 seconds). Sometimes I don't get kicked but it doesn't last very long (maybe 30-60 minutes). The owner and all my friends live very close in the same country (Norway) and everyone has an equal connection,  except me of course. Here's a list of what I've tried to fix this problem:

Restart my wifi, restarting my game, deleting AT launcher and hamachi (a friend told me this might solve the problem, but it didn't), the owner of the server have restarted the realm, restart my PC and switching network.

 

None of these has worked so I have no clue what to do. It would be nice if you could help me or guide me through the problem.