If the error occurs when publishing a new update to WSUS, the WSUS Signing Certificate is not properly installed in the Trusted Root or Trusted Publishers certificate store on the WSUS Server. If using the in-console third-party catalog feature in SCCM, you should see the following line in the SMS_ISVUPDATES_SYNCAGENT.log to confirm a new update fails to publish: If using the Patch My PC Publisher, you should see the following in the PatchMyPC.log before the signature validation error: The first is when publishing a new update to WSUS, and the second is when revising an already published update. There are two common scenarios where this error could occur. Is the File Signature Failed Error Happening when Publishing New Updates?
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