Unable to login or pull images from private DTR when in Linux mode

Docker Desktop for Windows
1

I’ve got a really odd issue here. When in Windows container mode, I can login and pull from my private DTR with no issues.

As soon as I switch to Linux containers, I get something like this on: docker login example.example.com:

Error response from daemon: Get https://example.example.com/v1/users/: dial tcp 104.239.207.44:443: i/o timeout

Everything works fine with dockerhub in Windows or Linux container mode.

Windows 10 Professional 64bit, using the stable version of Docker for Windows.

Thanks for any ideas