[Steam Error] - An unknown Steam error is preventing you from connecting to this s...

Hello guys, I'm new in killing floor{Dedicated Server}, and I'm having this error, already googled and found nothing, I downloaded through SteamCMD and steam itself, but the two are left with this error, also tried using "?multihome=IPTHOUSE" but to no avail, still the same error, is not only on my computer, but my friends who are trying connect, the doors are already released, do not know what can be, has anyone had this error? Has a solution?



Image:

http://ift.tt/YBlNSG



Thanks !!