Good question, the CA I had created for the OpenVPN usage did not had dots (.) or underscore (_) in any of the fields in the subject.
The Issuer was like this:
C = Switzerland, ST = Zurich, L = Zurich, O = Company Ltd, CN = Company Client VPN CA - G1
- Do you may have umlauts (ä, ö, ü or anything else non-7bit-ASCII) in any part of the certificate Subject? If yes, change and just use 7-bit ASCII.
- Is the validity of the Issuer Root CA longer (starts before and ends after) then of the individual user certificates?
- Is the 'Certificate Type' set to 'User Certificate' for the VPN user certificate?
The Issuer was like this:
C = Switzerland, ST = Zurich, L = Zurich, O = Company Ltd, CN = Company Client VPN CA - G1
- Do you may have umlauts (ä, ö, ü or anything else non-7bit-ASCII) in any part of the certificate Subject? If yes, change and just use 7-bit ASCII.
- Is the validity of the Issuer Root CA longer (starts before and ends after) then of the individual user certificates?
- Is the 'Certificate Type' set to 'User Certificate' for the VPN user certificate?