Users get an error when trying to join my server

[Khaz]

http://i.imgur.com/gQ4IQlT.jpg?1

This just started today.

Server worked perfectly for the last few days but suddenly broke when I tried hosting about an hour ago.
I disabled a couple of addons before-hand (which really should fix problems not cause them) but I've never seen this error before and I have no idea what's causing it.

[Ad Bot]

[Conan]

looks like something related to your internet security or something

though i cant think of why you'd be able to join and then only after joining while loading would the internet security kick in and remove the player

should check your security settings/firewall and maybe your router settings.

[Khaz]

looks like something related to your internet security or something

though i cant think of why you'd be able to join and then only after joining while loading would the internet security kick in and remove the player

should check your security settings/firewall and maybe your router settings.

actually they aren't able to join at all

but im not sure, that may be the case