KB Patch Stopped .Net Core API from Starting

George Belletty 0 Reputation points

We have a .Net Core 6 API running in IIS 10.

Since Sunday 26th February the API has been failing by timeout with the following error:

HTTP Error 500.37 - ASP.NET Core app failed to start within startup time limit

The environment is AWS - Windows Server 2016 Datacenter.

We suspect the issue started when a windows update patch was applied.

Our server team started uninstalling patches, and the API started to work again. But, the patch will be installed again automatically, so this is not a long term solution.

Unfortunately, we don't have the name of the windows update patch.

I'm not seeing any reports of this online from other dev teams.

Is this a known issue or does anyone have any more information about this?

Internet Information Services
Microsoft Technologies based on the .NET software framework.
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