Buddy Randomly Getting "Bad Login"

[k0d3st3r]

My Buddy and I have been going through a ton of different mod packs, just having fun, But throughout our journeys, there seems to be an issue that will not allow him to connect.

 

We'll disconnect to take a break for a bit, and then keep the server running (For farms, Quarries, and Refineries to do their thing)

And when he attempts to reconnect, he gets "Lost connection: Failed to login, Bad Login"

On my server it reads:

[sEVERE] [Minecraft-Server] Reached end of stream for (Insert his IP here)

[iNFO] [Minecraft-Server] (His User here) (His IP Here) lost connection.

 

He restarts his technic pack launcher, Minecraft itself, and even the his computer several times, but it still won't let him for random set periods of time, mostly forcing us to play something else until it works again.

 

I also restart my server several times during our attempts and getting him back in, and that doesn't work either... So it is on my end, or his end?
Any ideas on how to fix it?

 

Any help is appreciated

[Kalbintion]

Bad login is related to his connection to mojangs authentication servers. He'll need to relog into the launcher. Nothing can be done about this.