Workshop server files are in KFGame/Cache/ folder (then you will see subfolders named after the workshop item ID)
For Workshop maps, copy the map file name from this cache folder, to add it to the PCServer-KFGame.ini to be able to see the map in the webadmin (see wiki for reference, it is under the workshop part)
I myself had a problem, can someone at TWI have a look at this?
http://steamcommunity.com/workshop/...07979/412449508287138582/#c412449508292622920
and
+1 for the workshop request update check flood in the log. I do not think checking for updates every few seconds is relevant, in my opinion it should check at launch, every hour and/or every map change. But constant update check? why? I imagine if a machine got 20 servers (that is not unbelievable, My own server can handle around 24 KF2 standard servers so sure people got better machines and can do more), you do the maths Number of servers X number of workshop items (assuming they all have same amount of items) X number of workshop requests per hour = maybe getting blacklisted for DOS
by Steam... just a guess but not impossible, I never tried to flood a steam server with requests (and also it may increase a little CPU and network usage for nothing).
And by the way, thank you for having a proper workshop integration to server, that was not done right on RO2, now on KF2 it is well done
(maybe still a bug exists, if you can check the link above)