I am also affected by this bug. The following workaround works for me:
sudo ip route replace default via 0.0.0.0 dev tun0
I can provide lots of debugging information if needed.
** Also affects: openconnect (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1502847
Title:
network manager open connect establishes connect but vpn does not work
after connection is establlished.
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