Hello
expired CA certificate could also cause "SSL error: sslv3 alert certificate expired" error. You should check the validity of your CA certificate.
You can use this openssl command to verify your CA and your server certificate, see if it gives the same "certificate verify failed" error
openssl verify -verbose -CAfile $PATH_TO_CACERT $PATH_TO_SERVER_CERT
or it could be that your server clock is wrong, which is unlikely though.
best regards
Cary Huang
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Highgo Software (Canada)
www.highgo.ca