Windows 10 windows VPN IPv4 properties not accessible

I had the same issue you might need to find how to do what you need in powershell. For example I used this to change the use default gateway setting:

Set-VpnConnection "VPN Name" -SplitTunneling $True 

Update 2015-11-16: Fixed in TH2.

I just installed Cumulative update for Windows 10 version 1511: November 10, 2015. (Codename Threshold 2). The bug is gone. Clicking Properties now works and brings up the expected menu.

I made a point of checking before the reboot: Bug was still there.
And after the reboot/half-hour-install: Bug is now gone.

Original post preserved below.

Bug.

Seems to be a bug. Reproducible and everything.

Supposedly fixed in preview build: Windows 10 Build 10547 Insider Preview (fast ring) released September 18, 2015. Regular release date is not known.

Workarounds

Edit rasphone.pbk

All of a user's VPNs are saved in %appdata%\Microsoft\Network\Connections\Pbk\rasphone.pbk. This is a plain old ini-file and can be edited.

There you can copy entries from a known-good config. (Or if you have lots of time on your hands, then you can also read the Microsoft Documentation for the PBK file format: [MS-RRASM]: Routing and Remote Access Server (RRAS) Management Protocol: 2.2.2 File Format for Phonebook.)

Use PowerShell-cmdlets

Namely Set-VpnConnection.

I'm just pasting from the original article. Credits to his author. This worked for me.

Got some good news. We found a workaround. A colleague pointed me to the right direction (thanks Philippe! :-)). The properties of VPN connections are stored in PBK-files. There seems to be one file per user which contains all connections. The file is located here:

"C:\Users\[YOURUSER]\AppData\Roaming\Microsoft\Network\Connections\Pbk\rasphone.pbk"

You can open and edit it with an editor of your choice as it is a "good old" ini-like file. The property to be edited in this case is "IpPrioritizeRemote",wich is the same as "Use default gateway on the remote network". Just set it from "1" (true) to "0" and save. Afterwards it worked immediately for me as desired. There are plenty more properties if one has to change something else. I would strongly recommend to copy the file to a save place before starting to fiddle around with it This is surely not the preferred way to change those properties but a nice workaround for now. Be careful with it.