VPN (SonicWall) will not connect over T-mobile 5G Hotspot

bhorn wrote:

I don't known if this will help but  I could not use my tmo samsung s20+ 5g phone as a Hotspot to VPN into office from a laptop.  The solution was to change the properties of the wifi Hotspot device on my laptop to unchecked ipv6 and everything worked fine.

It's something worth trying, but it did not help me.   The core issue is that T-mobile does not support VPNs through a cell phone hotspot - as they have told me.   SSL-based VPNs do work, not because T-mobile goes out its way to support them but because SSL is so pervasive a hotspot that did not allow it would be all but useless.

In my case, I am trying to use an IKEv2-based VPN - which is native to Windows - but requires a bit of effort on the part of the carrier to allow the necessary ports and protocols to be opened/allowed.  T-mobile is apparently unable or unwilling to make this effort.