Extension marketplace is returning this when trying to search for extension Error while fetching extensions. Server Returned 503
here is information about VsCode:

Version: 1.69.2
Commit: 3b889b090b5ad5793f524b5d1d39fda662b96a2a
Date: 2022-07-19T13:15:38.080Z (3 days ago)
Electron: 18.3.5
Chromium: 100.0.4896.160
Node.js: 16.13.2
V8: 10.0.139.17-electron.0
OS: Linux x64 5.18.12-arch1-1

CodePudding user response：

I solved it in the following way:

1. Change your router and device DNS to CloudFlare/Google from whatever you are using specifically, assuming it is the ISP's one.

2. Restart your network service:

   sudo systemctl restart systemd-resolved.service
   

3. Flush your DNS cache:

   sudo resolvectl flush-caches
   

4: Restart your PC

…and voila! It worked for me this way.