"Cannot start openVPN" error after high Sierra upgrade

[polarbreeze]

Anyone know what might be going on here, since High Sierra upgrade?

Many thanks for any pointers!

When I try to connect to the VPN I get:

Tunnelblick was unable to start OpenVPN to connect (username@domain) For details, see the log in the VPN Details… window

And the log says:

*Tunnelblick: OS X 10.13.2; Tunnelblick 3.7.4b (build 4921); prior version 3.7.4a (build 4920)

2017-12-26 09:59:02 *Tunnelblick: Attempting connection with (username@domain); Set nameserver = 769; monitoring connection

2017-12-26 09:59:02 *Tunnelblick: openvpnstart start (username@domain).tblk 1337 769 0 3 0 1065264 -ptADGNWradsgnw 2.4.4-openssl-1.0.2n

2017-12-26 09:59:03 *Tunnelblick: 

Could not start OpenVPN (openvpnstart returned with status #251)

Contents of the openvpnstart log:

*Tunnelblick: openvpnstart log:

     OpenVPN returned with status 1, errno = 0:

          Undefined error: 0

[Tunnelblick developer]

See this discussion.

If that doesn't help, please follow the instructions at Read Before You Post to get the info needed to diagnose problems and then post that info.