During my work with a customer renewing their Issuing CA’s certificate based on the steps documented in this article, I discovered that the Request file generated couldn’t be located in the default location of %systemDrive% . The Issuing CA didn’t log any errors in the Event Log, nor did it post any error messages. I also searched for all files with the extension *.req on all drives, and still couldn’t find the file.
After some more research, I discovered that my customer changed the default location of the RequestFileName Registry Key during their installation to a drive that no longer exists on the CA. The location configured was a:\%1_%3%4.req. I followed these steps to fix this issue:
I was then able to create the Request File and submit it to the Offline Root CA to process it.
Thanks, this is the solution off my Problem. Betwin the last Renew off our Issunig CA we have Virtualising the System. so thats the resson we have lost drive a: