Another Breaking Change in Agent-based Azure Hybrid Worker

We already know, or should know, that Microsoft is deprecating agent-based Hybrid Worker on August 31st, 2024. So far, so good. This article was written in July 2023, so we still have a year to go. So we found another Breaking Change at one of our Customers, which was not so publicly announced. At least we hadn’t found any Notes until we faced a Problem.

One of our Customers, an Agent-based Hybrid worker, stopped working on July 14th, 2023, without any notable Reason.

The only thing we have seen in the Logs was the following Message.

Log Name: Operations Manager
Event ID: 4004
Message: HTTP operation failed with error “A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.” (0x800B0109). The query will be retried later. The article KB3126513 has additional troubleshooting information for connectivity issues.

URL for Operation: https://opinsightsweuomssa.blob.core.windows.net/configurationfiles/20230719%5C97171619-296f-4f7e-bbdb-024ed107adb6?sv=2018-03-28&sr=b&sig=05Ejtqp4U6DXTPs%2FhCtMrRuCiexZib0T49eJzTIo4w4%3D&se=2023-07-19T20%3A46%3A27Z&sp=r

After a long search and a bit of despair, we luckily found an article from Microsft that pointed us in the right direction.

Behandeln von Problemen mit dem Log Analytics-Agent für Windows – Azure Monitor | Microsoft Learn

The above Article mentioned that Certificates will not work after June 2023 for older Clients. So we checked the Agent Version, and that is it.

After we figured out that our Agent was too old, we updated the Agent as described, and the Hybrid Worker Connection was fine again.

How to update an Agent can be read here: Manage the Azure Log Analytics agent – Azure Monitor | Microsoft Learn

Michael Seidl aka techguy
au2mate everything