Sometimes, OpenVPN for Win32 platform may refuse to start because all TAP-Win32 virtual ethernet adapters are in-used. In fact, this situation is just confusing state that OpenVPN is unable to open the adapters. Below is my solution.

My solution is to remove all TAP-Win32 virtual ethernet adapters and then create a new one afterwards.

1. Go to Start -> Programs -> OpenVPN -> Delete ALL TAP-Win32 virtual ethernet adapters

2. Go to Start -> Programs -> OpenVPN -> Add a new TAP-Win32 virtual ethernet adapter

Well done.

Tags: openvpn, tap-win32