Is there any way to get details from signtool.exe for timestamp server errors?

Yes, you can get more details about timestamp server errors by adding the /debug flag when using signtool.exe to sign your files. This will generate a log file that contains more detailed information about the timestamp server errors.

Here is an example command that you can use to sign a file with signtool.exe and generate a log file with debugging information:

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signtool.exe sign /debug /tr http://timestamp.digicert.com /td sha256 /fd sha256 /a "path\to\file.exe"

This will sign the file with a timestamp from the http://timestamp.digicert.com server and generate a log file that you can use to diagnose any timestamp server errors.

You can also specify a different path for the log file by adding the /debugLog flag followed by the path to the log file. For example:

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signtool.exe sign /debug /debugLog "C:\logs\signtool.log" /tr http://timestamp.digicert.com /td sha256 /fd sha256 /a "path\to\file.exe"

This will save the log file to C:\logs\signtool.log.