signtool.exe "Error: SignerSign() failed." (-2146869243/0x80096005)

[RetFeli]

Since many years we sign our build with signtool.exe successfully.

But today we get the following error on all computers:

1>C:\Program Files (x86)\Windows Kits\10\bin\10.0.17134.0\x64\signtool.exe
1>APP_999.dll 03.06.2020 11:16:00
1>*************************************************************************************
1>Sign sha1 1 "APP_999.dll" with: Comodo2018.pfx
1>The following certificate was selected:
1> Issued to: Company
1>
1> Issued by: COMODO RSA Code Signing CA
1>
1> Expires: Fri Nov 19 01:59:59 2021
1>
1> SHA1 hash: 2619EE16E2AE76AC49A2DFC951974E522E20F70A
1>
1>
1>Done Adding Additional Store
1>EXEC : error information: "Error: SignerSign() failed." (-2146869243/0x80096005)
1>EXEC : SignTool error : An unexpected internal error has occurred.

Visual studio and the build process are unchanged.
The certificate is still valid.

How to fix this?

Reto Felix

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