Is the Verisign Timestamp server down?
I received an official response from Verisign this afternoon (on 2 Jan 2021):
Thank you for contacting Verisign Support.
This server was deprecated after our authentication services were sold to Symantec, which is now Digicert. You can find a list of free timestamp servers online or theirs is now at http://timestamp.digicert.com.
If you have additional questions, please do not hesitate to contact us.
http://timestamp.verisign.com timestamp server is no more.
At the moment I know of the following alternatives (in addition to Digicert above) which work well:
When using Microsoft's SignTool.exe
Change the timestamping server (
signcode -t "http://timestamp.verisign.com/scripts/timstamp.dll"(defunct)
signcode -t "http://timestamp.digicert.com"