Invalid Response during Secondary Validation

Response from Certificate Authority: During secondary validation:

Invalid response: 403 [Forbidden :: urn:ietf:params:acme:error:unauthorized]

I see the challenge written to the directory during the start of the process and then it is removed just before this error appears. I am able to drop a test file in this location and access it both internally and externally.

I would appreciate any help to get this resolved.

Windows Server 2019 with IIS
Certify Certificate Manager (Version

Hi, I’ve added a general topic about this issue due to recent Let’s Encrypt changes and how to resolve it: Info: Let's Encrypt Secondary Validation Failures

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