help check addon

Hi, 3 days ago I write, about server problem, now I know, what this trouble causes something from this list

http://puu.sh/9uXfd/05b8a2dd6f.jpg

Problem:
Players just plaing on server and after somethink 90% clients, just closed without reason, server console print this:
console: STEAMAUTH: client <Name> received failure code 6
In logs: Client <Name> dropped from server

After i clean server, delete many addons and another things, and 15 minuts and again, at the moment on server was only addons which you can see in the picture

thx.

Remove addons one by one daily until the issue is gone.

Thx. I try this