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When using FortiClient on Ubuntu 22.04, the user may get the following error while trying to connect to SSL VPN: Backup DNS Failed.
When this error is seen the VPN connection will fail most of the time.
In the FortiClient debug logs the following traces will be visible:
11:07:20.998 TZ=+0200 [sslvpn:INFO] main:1456 State: Configuring tunnel
11:07:21.068 TZ=+0200 [sslvpn:DEBG] vpn_util:260 Get connection name: ????????? ?????????? 1
11:07:21.068 TZ=+0200 [sslvpn:DEBG] vif:98 Using nmcli to allocate tun device.
11:07:21.367 TZ=+0200 [sslvpn:DEBG] dns:274 Default route device name: enxc8f750b40f75
11:07:21.430 TZ=+0200 [sslvpn:DEBG] vpn_util:260 Get connection name: ????????? ?????????? 1
11:07:21.430 TZ=+0200 [sslvpn:DEBG] dns:286 DNS backup
11:07:21.496 TZ=+0200 [sslvpn:DEBG] vpn_util:234 Get auto DNS setting failed.
11:07:21.496 TZ=+0200 [sslvpn:EROR] vpn_connection:1634 Backup DNS failed <------
When this issue is observed, the network/WiFi connection details between the PC (on which FortiClient is installed) and the internal router/ISP modem/cellphone hotspot need to be checked. Mostly this error will be seen with a WiFi/SSID connection.
To resolve the issue check that the SSID name has no accents or spaces (UTF-8 characters), if it has, then rename it without any accents or spaces or UTF-8 characters which will resolve the issue.
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