I have also hit this bug in latest version of Linux Mint 18. I can confirm that the timeout has somehow reverted to 25 seconds, while previous versions of network manager allowed much longer.
Note that the timeout is overall from the moment of the first POST to the VPN address. Our corporate VPN gateway redirects to the nearest VPN available. Assigning this new redirect takes almost all of the 25 seconds. Occasionally one can type in username/password and get in under the 25 sec bar. If the 25 seconds started from the actual VPN negotiation it would work just fine. Using the command: sudo openconnect -u myusername mycorporate.accessaddress.com ..allows me to launch my vpn session manually. It also prints out the redirect address, and I can then create a new network-manager vpn connection with this address, which connects much faster. I am using this as a workaround for the time being. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1575354 Title: Connecting to VPN times out after 25 seconds if login credentials not entered Status in NetworkManager: Confirmed Status in network-manager package in Ubuntu: Confirmed Bug description: Connecting to OpenConnect VPN through the Gnome GUI fails because NetworkManager times out while requesting credentials through the GUI form in Ubuntu 16.04. It worked (is working on other computers I'm working on) fine from Ubuntu 12.04-15.10. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: network-manager-openconnect 1.0.2-1build1 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: GNOME Date: Tue Apr 26 22:06:41 2016 SourcePackage: network-manager-openconnect UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1575354/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp