Error: SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

[Omis]

I was using OpenVPN normally before on a windows 7, but without making any changes to the configuration, I just got an error today from all the configs I have. Every error is the same for all the working configs I was using before.

Sat Jan 31 08:17:18 2015 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Sat Jan 31 08:17:18 2015 Socket Buffers: R=[8192->8192] S=[8192->8192]
Sat Jan 31 08:17:18 2015 UDPv4 link local: [undef]
Sat Jan 31 08:17:18 2015 UDPv4 link remote: [AF_INET]14.42.107.87:1195
Sat Jan 31 08:17:18 2015 MANAGEMENT: >STATE:1422681438,WAIT,,,
Sat Jan 31 08:17:18 2015 MANAGEMENT: >STATE:1422681438,AUTH,,,
Sat Jan 31 08:17:18 2015 TLS: Initial packet from [AF_INET]14.42.107.87:1195, sid=01cf43e2 daabdb11
Sat Jan 31 08:17:18 2015 VERIFY ERROR: depth=0, error=self signed certificate: CN=nal.jp, O=lc36k8 1fvs6q4lpik, C=US
Sat Jan 31 08:17:18 2015 TLS_ERROR: BIO read tls_read_plaintext error: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
Sat Jan 31 08:17:18 2015 TLS Error: TLS object -> incoming plaintext read error
Sat Jan 31 08:17:18 2015 TLS Error: TLS handshake failed
Sat Jan 31 08:17:18 2015 SIGUSR1[soft,tls-error] received, process restarting
Sat Jan 31 08:17:18 2015 MANAGEMENT: >STATE:1422681438,RECONNECTING,tls-error,,

Need help, thanks.

[maikcat]

are you administer the server too?

did you change any certificate?

Michael.

[Omis]

are you administer the server too?

did you change any certificate?

Michael.

Yes, I am.

No, I did not made any changes.

[maikcat]

post client/server configs and server log.

Michael.