OpenVPN Server and Client common issue

1. How to automatically log in to OpenVPN on Windows :

The following launch string is needed for either method:

For 32 bit Windows - "C:\Program Files\OpenVPN\bin\openvpn-gui.exe" --connect client.ovpn

For 64 bit Windows - "C:\Program Files (x86)\OpenVPN\bin\openvpn-gui.exe" --connect client.ovpn

The client is replaced with the name of the OpenVPN configuration file you wish to start. Your list of available .ovpn files can be found in the 'OpenVPN/config' folder on your computer.

You now need to add this to your WIndows registry start settings. Open regedit on your computer and go to:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

Add a new string entry. Give it a name you can identify later such as "openvpn" then add the above string.

OpenVPN auto start

2.  TLS related Error :

Wed Aug 27 16:05:18 2014 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
Wed Aug 27 16:05:18 2014 TLS Error: TLS handshake failed

Solution  :
1. may be openvpn server was not start
2. Check firewall - may respected port is not opened or try with disabled windows or third party firewall

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3. Error: 

VERIFY ERROR: depth=1, error=certificate is not yet valid:  in openvpn

Solution :

It may be date/time is not correct server and client machine.

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4. Error: 

No server certificate verification method has been enabled.

Solution :
make entry in client.ovpn  file
ns-cert-type server