Forum Discussion

MCT

Jul 28, 2026

Open in VS Code for the web fails ... tunnel 400 error ?

Hello everyone, The last week I have problem connecting to VS Code for the Web, my cloudshell works correctly, my account is ok, everything works BUT when tryont to open through browser - azure por...

azure

developer tools

Kidd_Ip

MVP

Jul 29, 2026

I believe it may be caused by your local environment. The supported resolution is to verify connectivity to the Azure Relay host and, if the error persists across regions and devices, open a support request with Microsoft including correlation IDs.

https://learn.microsoft.com/en-us/azure/cloud-shell/faq-troubleshooting

https://learn.microsoft.com/en-us/azure/cloud-shell/vnet/troubleshooting

PanosGR191
MCT
Jul 29, 2026
Hi,
I don't think the local environment is the problem because I have reproduce the problem testing on
different browsers, InPrivate-Incognito windows, clearing cache , connecting from another pc - server - even from azure vm (!!)

And again just to be clear, I am talking about launching-opening from the azure portal the "VS Code for the Web" button , and NOT the editor button ! (the editor button works .... all other parts inside my cloudshell session works !!) .

I haven't collect all logs, will do it the next hours that I will have some available time, but unfortunately I don't know if I can open a support ticket because the Subscription is a VisualStudio offering , and doesn't have tech.support plan available ! :(

Anyway thanks for your time , I hope I will find a way to send those logs to MS support (even without proper "support plan", ) and solve the problem,

Many thanks
Panos