2018.04.09
i was playing through steam - killing floor
server: onyx | hardcore | insta-lvl 6 | dlc unlocked | custom maps | greylisted
alone on map when i got kicked by an admin popup, then server settings got changed to allow 12 people and suddenly 6 people were in the server and the map was changed to
KF - nightmare in the skatepark
I suspect the admin was [ARG]OY_VEY
since i tried to rejoin on the new map and again once the game started i was again kicked with an admin popup
ip 160.202.165.12:7707

There was no admin email address "to report the unjust ban" as mentioned in the admin popup.
I traced the server here
https://www.gametracker.com/server_info/160.202.165.12:7707/

The admin playing is making the server a private server and is kicking off anybody that was playing before it gets there and allows a bunch of its friends private access to the the server (that is listed in the Killing Floor server list as public.)

Your assistance is appreciated

Gametracker neither owns nor manages any of the game servers registered on this site.
We are strictly a server tracking site and take no part or interest in the day to day management or game play of servers.

I note that the server in your link does not have a registered owner or contact web site.
There is therefore a very good chance that they do not even know they have been registered here.