when our clients try to connect to server today, they received a message
hu Oct 06 10:00:02 2016 UDPv4 link local: [undef]
Thu Oct 06 10:00:02 2016 UDPv4 link remote: [AF_INET]remoteip:1194
Thu Oct 06 10:00:02 2016 VERIFY ERROR: depth=0, error=certificate has expired: C=IT, ST=Toscano, L=Pisa, O=Mechgroup, O=21232f297a57a5a743894a0e4a801fc3, OU=Design, CN=Openvpnmech, emailAddress=smnirosh@mechdesign.it
Thu Oct 06 10:00:02 2016 TLS_ERROR: BIO read tls_read_plaintext error: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
Thu Oct 06 10:00:02 2016 TLS Error: TLS object -> incoming plaintext read error
Thu Oct 06 10:00:02 2016 TLS Error: TLS handshake failed
Thu Oct 06 10:00:02 2016 SIGUSR1[soft,tls-error] received, process restarting
I found in the manage certification section the root certification is expired. I renew the certificate by clicking * icon on the same row. But the error is still the same.
what can I do now?