FAILED to Synchronize - BigFix could not verify the authenticity of the site content

Content Authoring
1

We are getting error in client logs “FAILED to Synchronize - BigFix could not verify the authenticity of the site content.” and after that servers remain in constrained state.

2

The error message is issued when BigFix Client cannot verify the digital signature for the actionsite.
There is KB article already published by HCL
BigFix Client cannot verify digital signature for actionsite - Customer Support.