By “signature” do you mean the application secret key? Resetting the secret key in the Duo Admin Panel invalidated the secret key stored in the registry on your server when you did the initial Duo WinLogon install. You will need to update the secret key on the server to the current value.
Here are some possible ways to do this:
- Remote registry edit to update the
HKLM\SOFTWARE\Duo Security\DuoCredProv\SKEY value to the current secret key from the Admin Panel.
- If the Duo application was configured to fail open if it can’t contact our service, remote UNC edit of the
c:\windows\system32\drivers\etc\hosts file to add a bogus entry for your Duo API hostname to cause it to fail open.
Some other suggestions in this thread: 40102: 'Invalid integration key in request credentials' ('')