Why can't I connect to my OpenVPN server?
I've found that I receive the error
VERIFY ERROR: depth=0, error=CRL has expired in my server logs. What is causing this?
It looks like you have an expired CRL, and you can regenerate this with your KPI manager (typically openssl). The following documentation on OpenSSL may prove useful, and I was also able to find an instance of someone else solving this exact issue: