With Windows 7 and Windows 8 and OpenVPN we sometimes see the following error when people are having trouble connecting.
  • Warning: route gateway is not reachable on any active network adapters
This is a bug with either OpenVPN, Windows or the TAP driver and it usually happens when you have had your computer in hibernation and then wake it up again.

Try rebooting your computer. This often fixes the problem.

Two more options to try are below:

Adding netsh:

  • Click the on OpenVPN or Viscosity icon in the taskbar
  • Select the server you want to connect to, but instead of connecting, choose Edit Config
  • A notepad window will open,please don't change any of the lines
  • At the end of the file, one new line, please add the following 3 lines:

route-delay 5
route-method exe
ip-win32 netsh

  • Save and close the file, Try to connect
Reset the Internet Catalog:

  • Find the Command Prompt option in the Start Menu
  • Right-click on the Command Prompt  and select "Run as administrator"
  • Once started a black window will appear, where you should type comands.
  • Enter the following two commands, each followed by the ENTER key:
netsh winsock reset
netsh int ip reset 

  • Make sure these commands did not you give you an error.
  • Close the Command Prompt window and try to connect.