Description

Publishing to Experience Edge might hang. In this case, the publish job remains in the running state endlessly, and all subsequent publish jobs get stuck in the publishing queue. The following message can be found in the logs:

ERROR Error processing ack messages [ExperienceEdge Publishing]: An error has occurred while publishing Ack events.
Exception: Sitecore.ExperienceEdge.Connector.ContentHubDelivery.Exceptions.EdgeApiException
Message: [ExperienceEdge Publishing]: An error has occurred while publishing Ack events.
Source: Sitecore.ExperienceEdge.Connector.ContentHubDelivery
   at Sitecore.ExperienceEdge.Connector.ContentHubDelivery.Delivery.Ack.EdgePublishAckManager.<GetNextAckBatchMessage>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Sitecore.ExperienceEdge.Connector.ContentHubDelivery.DirectPublish.Delivery.Export.Blocks.ProcessAckMessagesBlock.<AckBatchMessageReader>d__20.MoveNext()

Nested Exception

Exception: Grpc.Core.RpcException
Message: Status(StatusCode="Unknown", Detail="Received http2 header with status: 520", DebugException="Grpc.Core.Internal.CoreErrorDetailException: {"created":"@1676287115.302000000","description":"Received http2 :status header with non-200 OK status","file":"..\..\..\src\core\ext\filters\http\client\http_client_filter.cc","file_line":134,"grpc_message":"Received http2 header with status: 520","grpc_status":2,"value":"520"}")
Source: Sitecore.ExperienceEdge.Connector.ContentHubDelivery
   at Sitecore.ExperienceEdge.Connector.ContentHubDelivery.Infrastructure.EdgePublishAckAutoConnectClient.<GetNextAckBatch>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.ExperienceEdge.Connector.ContentHubDelivery.Delivery.Ack.EdgePublishAckManager.<GetNextAckBatchMessage>d__5.MoveNext()

Solution

To resolve the issue, consider one of the following options compatible with the affected product version:

• For Sitecore XP 10.3 and Sitecore Experience Edge Connector 21.0.0, download and install the hotfix found on this page: SC Hotfix-573968-1 ExpEdge 21.0.0 rev. 0164.zip
• For Sitecore XP 10.2 and Sitecore Experience Edge Connector 20.0.0, download and install the hotfix found on this page: SC Hotfix 573967-1 ExpEdge 20.0.0 rev. 00139.zip
• For Sitecore XP 10.2 and Sitecore Experience Edge Connector 19.0.0:
  1. Upgrade Sitecore Experience Edge Connector to version 19.0.1 depending on your configuration:
     • For Sitecore Experience Manager (XM), download and install the upgrade package from here.
     • For Sitecore Experience Platform (XP), download and install the upgrade package from here.
  2. Download and install the following hotfix: SC Hotfix 573969-1 ExpEdge 19.0.1 rev. 00113.zip
• For Sitecore XP 10.1 and Sitecore Experience Edge Connector 18.0.0:
  1. Upgrade Sitecore Experience Edge Connector to version 18.0.1 depending on your configuration:
     • For Sitecore Experience Manager (XM), download and install the upgrade package from here.
     • For Sitecore Experience Platform (XP), download and install the upgrade package from here.
  2. Download and install the following hotfix: SC Hotfix 574612-1 ExpEdge 18.0.1 rev. 00106.zip

  
  Be aware that the hotfixes were built for the specific Sitecore XP and Sitecore Experience Edge Connector versions and must not be installed on other Sitecore XP and Sitecore Experience Edge Connector versions or in combination with other hotfixes. In case any other hotfixes have already been installed on a certain Sitecore XP instance, send a request for a compatibility check to Sitecore Support.

  Note that the ZIP file contents must be extracted to locate installation instructions and related files inside. The hotfix must be installed on a CM instance and then synced with other instances using standard development practices.