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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns".

Solutions on the web

via by Unknown author, 1 year ago
via GitHub by blacknight4u
, 1 year ago
Cannot contact authentication server
via GitHub by mibby
, 1 year ago
Cannot contact authentication server
via GitHub by l89669
, 8 months ago
Cannot contact authentication server	at	at	at	at	at	at	at	at	at	at	at	at	at	at	at	at	at	at com.mojang.authlib.HttpAuthenticationService.performGetRequest(	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(	at$LoadingValueReference.loadFuture(	at$Segment.loadSync(	at$Segment.lockedGetOrLoad(	at$Segment.get(	at	at	at$LocalLoadingCache.get(	at$LocalLoadingCache.getUnchecked(	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(	at undefined.bcd.L(SourceFile:2764)	at undefined.bwk$	at java.util.concurrent.Executors$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at