Some believe this is directly to a Steam client update which broke EAC and was reverted. My own experience is that the error relates to the “Official Realm”. I am able to get on the “Modded Realm” with no issues BUT on the “Official Realm” the error occurs. Note: Have validated files (no errors), …

[image] Fatal Error/Easy AntiCheat Error Technical Support Hey folks! We’re looking in to this one. Seems some funk between Steam itself and EAC, Steam did a rollback of an update noting EAC as a reason. We’re seeing what we need to do (or can do) on our side to see this r…

Steam - Backend Rejected The Challenge Response

Warhammer: Vermintide 2 Technical Support

Fatshark_Hedge October 8, 2021, 10:35am 2

Topic		Replies	Views
Fatal Error/Easy AntiCheat Error Technical Support acknowledged	13	1526	October 16, 2021
Official Realm doesnt run, but modded Technical Support acknowledged	2	752	March 30, 2021
Backend reject the challenge response Technical Support acknowledged	3	1115	October 15, 2021
Game dont start in official realm, only open in modded realm Technical Support acknowledged	3	426	September 20, 2018
Linux modded realm \| Backend rejected the challenge response -1 Linux Discussion	4	33	March 23, 2026

Steam - Backend Rejected The Challenge Response

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