OpenVPN - "Waiting for TUN/TAP interface to come up..."

August 5, 2022
When using OpenVPN on Windows, we periodically experienced the error "Waiting for TUN/TAP interface to come up...". Sometimes a reboot solved the problem. OpenVPN's documentation suggested to reset the TCP/IP stack which worked, but reset the settings for all our network adapters, and did not permanently solve the problem. The fix we found was: 1) Navigate to Network Connections. 2) Right-click the TAP-Windows Adapter and choose Properties. 3) From the list of protocols, uncheck anything you don't need. This connection only uses TCP/IPv4 so nothing else in our list is checked. After correcting this, the VPN worked properly.