Unable to forward ports. Network Error.

[chmod777john]

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About one week ago, everything works well. And today I meet the same error.

Uable to forward localhost:3000. Network Error.
We noticed that you were unable to forward a port due to an issue with your network. Our port forwarding infrastructure has been upgraded and there might be additional actions for you to take to in order to avoid disruption.

I have tried on two of my Windows computer. And one of my friend also tried on his. None of the 3 Windows works.

However, I have tested on this, and it works well.

https://github.com/fcwu/docker-ubuntu-vnc-desktop

I open this project in a codespace, and then docker run -p 6080:80 -p 5900:5900 -v /dev/shm:/dev/shm dorowu/ubuntu-desktop-lxde-vnc to start the remote ubuntu desktop.

From the remote desktop, I installed VSCode and extensions, and open a codespace with this "remote desktop VSCode", everything works well. The port can be forwarded.

So I don't think it is a firewall issue. I believe the Github team or VSCode team have done something that lead to this bug. It may be temporary or not.

By the way, I live in China and I use a VPN. (We cannot connect to Github without a VPN.) I'm not sure if that matters. The 3-Windows-tests above all use a VPN tool called clash. Here is the link https://github.com/MetaCubeX/mihomo/tree/Alpha

This bug is duplicated with https://github.com/orgs/community/discussions/68324#discussioncomment-9235675

That issue was reported few months ago. I think the Github team may have fixed that issue at that time. But the modification today(or yesterday) breaks things down agian.