auto connect vpn with password

The problem seems to be, that your password in keyring is not accessible.

Source

Solution mentioned there is to open file /etc/NetworkManager/system-connections/ConnectionName and set the

password-flags=0

and add the below lines to the file

 [vpn-secrets]
 password=YourPassword

Then restart network manager to pick up the change:

 sudo restart network-manager

For more info refer the source

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