Initially, it was prompting for credential details and working fine. after a set of software was installed(win10) it stopped prompting and taking different credentials on its own instead of asking for credentials and GP was unsuccessful in connecting to VPN. In my case, GP was using the user credential of VisualStudio login details (which was one of the software I installed) and trying to connect to GP and failed. I uninstalled visual studio (including registry cleanup using software like Revo uninstaller), rebooted the machine. After that GP was prompting for Credential and successful in connecting.
... View more