Okay, just to have some technical evidence here, the difference between the timeouts on 15.10 and 16.04.
What did was that I just ran these commands and did input nothing in the credentials GUI and waited until it times out.
15.10:
$ time nmcli con up VPN-NAME
Error: Timeout 90 sec expired.
real 1m30.583s
user 0m0.072s
sys 0m0.016s
16:04:
$ time nmcli con up VPN-NAME
A password is required to connect to 'VPN-NAME'.
Warning: password for 'vpn.secrets.gateway' not given in 'passwd-file' and nmcli cannot ask without '--ask' option.
Error: Connection activation failed: no valid VPN secrets.
Okay, just to have some technical evidence here, the difference between the timeouts on 15.10 and 16.04.
What did was that I just ran these commands and did input nothing in the credentials GUI and waited until it times out.
15.10:
$ time nmcli con up VPN-NAME
Error: Timeout 90 sec expired.
real 1m30.583s
user 0m0.072s
sys 0m0.016s
16:04: gateway' not given in 'passwd-file' and nmcli cannot ask without '--ask' option.
$ time nmcli con up VPN-NAME
A password is required to connect to 'VPN-NAME'.
Warning: password for 'vpn.secrets.
Error: Connection activation failed: no valid VPN secrets.
real 0m25.185s
user 0m0.044s
sys 0m0.020s