Environment

Windows build number 10.0.19041.746
Ubuntu 20.04
Linux version 4.19.128-microsoft-standard (oe-user@oe-host) (gcc version 8.2.0 (GCC)) #1 SMP Tue Jun 23 12:58:10 UTC 2020  

Steps to reproduce

The error can be reproduced by running any X server related command. I have been using xeyes for troubleshooting

xeyes strace output

Expected behavior

A pair of eyes should open outside of the terminal which follows my mouse. (All other X server programs have a similar error)

Actual behavior

Nothing happens and I get the following error in my terminal:
Error: Can't open display: localhost:0.0

Additional Details

I have tried running Xming and XLaunch/VcXsrv using the -ac flag. I have also attempted to use the X410 X server with the same result.

VcXsrv is system tray: DESKTOP-LN1HSHQ:0.0 - 0 clients

In /etc/ssh/sshd_config I have set X11Forwarding yes X11UseLocalhost yes

I have tried setting DISPLAY to
localhost:0.0
:0.0
127.0.0.1:0.0
$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}'):0 Which is my address from /etc/resolv.conf

As an additional note, setting DISPLAY=$(cat /etc/re....):0 results in an ~30 second delay before the error occurs. All other DISPLAY settings produce the error instantly.

Disabling Windows Defender Firewall had no effect.