I tested four different servers using UDP but could only connect to openvpn.nl.01.shellfire.net which is at port 80 while the others are at port 53:
Code: Alles auswählen
$ grep openvpn /etc/openvpn/*/client.ovpn
/etc/openvpn/openvpn.be.01.shellfire.net/client.ovpn:remote openvpn.be.01.shellfire.net 53
/etc/openvpn/openvpn.de.13.shellfire.net/client.ovpn:remote openvpn.de.13.shellfire.net 53
/etc/openvpn/openvpn.nl.01.shellfire.net/client.ovpn:remote openvpn.nl.01.shellfire.net 80
/etc/openvpn/openvpn.nl.03.shellfire.net/client.ovpn:remote openvpn.nl.03.shellfire.net 53
In openvpn I see that the TLS negotiation fails:
Code: Alles auswählen
20:33:10 2017 TLS: Initial packet from [AF_INET]151.236.14.50:53, sid=87a11559 c867a052
20:33:10 2017 VERIFY OK: depth=1, C=DE, L=Frankfurt am Main, O=www.shellfire.de, CN=www.shellfire.de CA, emailAddress=hosting@shellfire.de
20:33:10 2017 VERIFY KU OK
20:33:10 2017 Validating certificate extended key usage
20:33:10 2017 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication
20:33:10 2017 VERIFY EKU OK
20:33:10 2017 VERIFY OK: depth=0, C=DE, L=Frankfurt am Main, O=www.shellfire.de, CN=server, emailAddress=hosting@shellfire.de
20:34:10 2017 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
20:34:10 2017 TLS Error: TLS handshake failed
Any idea?