diff --git a/src/SignalR/server/StackExchangeRedis/test/RedisEndToEnd.cs b/src/SignalR/server/StackExchangeRedis/test/RedisEndToEnd.cs
index 24ae992907bf..0cf7878f4f4c 100644
--- a/src/SignalR/server/StackExchangeRedis/test/RedisEndToEnd.cs
+++ b/src/SignalR/server/StackExchangeRedis/test/RedisEndToEnd.cs
@@ -60,6 +60,7 @@ public async Task HubConnectionCanSendAndReceiveMessages(HttpTransportType trans
         [ConditionalTheory]
         [SkipIfDockerNotPresent]
         [MemberData(nameof(TransportTypesAndProtocolTypes))]
+        [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/33851")]
         public async Task HubConnectionCanSendAndReceiveGroupMessages(HttpTransportType transportType, string protocolName)
         {
             using (StartVerifiableLog())
@@ -121,6 +122,7 @@ public async Task CanSendAndReceiveUserMessagesFromMultipleConnectionsWithSameUs
         [ConditionalTheory]
         [SkipIfDockerNotPresent]
         [MemberData(nameof(TransportTypesAndProtocolTypes))]
+        [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/33851")]
         public async Task CanSendAndReceiveUserMessagesWhenOneConnectionWithUserDisconnects(HttpTransportType transportType, string protocolName)
         {
             // Regression test: