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KF2 Custom Server / Connection Lost / Package "ServerExt" version mismatch

Cellmember

FNG / Fresh Meat
Mar 1, 2016
4
0
Earth
Been playing KF2 on a Custom Legion server for a little bit now until recently 3 days ago I started to get Connection Lost/ Package "ServerExt" version mismatch and or Connection to the host has been lost.

What I've done to try to remedy the situation on my end
Clear KF2 Cache
Verify Cache
All ports fowarded
Disabled and enabled game through firewall
Reset router to default settings
Uninstall KF2 Completely and all traces of it
Uninstalled Steam
Completely formatted OS with a fresh install of everything with all updates related to Windows and all drivers for my hardware components.

Still getting the same error and most likely not related on my end the only other thing I can think of is that Steam cloud is somehow involved for the game even though 0 of 100mb is used up, so even disabled steam cloud and fresh install etc of KF2 no dice.

The other option is it could be on KF2 Master Server side, which I have absolutely no control over.

Any one else having the same problem ? Does any one know of any fix or possibly anything else that can be done that I have not tried/listed.

Any help would be greatly appreciated !