What is wrong with Azure WebApp LogStream. It is not working for days now.

Question

I use Logstream to debug code on azure before it goes into production

The last weeks (or is it months) it is taking a long time to connect.

The last days it stopped working for all webapps that I checked. I did no make any changes in app setting or whatsoever.

It is showing connecting all the time or
It shows "this feature requires write permission to your app""
After a refresh, it just shows connecting .. all the time again.

In the good days it showed connecting and after a couple of seconds : connected!

• I am Global Admin in Azure
• Application logging (Filesystem) is set to On
• The APPLICATIONINSIGHTS_CONNECTION_STRING has a value

Any guidance is much appreciated.

Answer 1

Hi @Hessel Wellema
If Azure Web App Log Stream is stuck on Connecting or shows This feature requires write permission to your appEnable Application Logging (Filesystem) This setting is required for logs to be streamed and turns off automatically after 12 hours.
Enable logging docs

Check Your Permissions Even Global Admins need a role that includes the Microsoft.Web/sites/publish/Action permission. Use Contributor or Website Contributor roles.

Check WEBSITE_LOCAL_CACHE_OPTION If this is set to Always, log streaming might not work. Set it to Off if needed.

Use Azure CLI as a Backup Run this command to stream logs from the command line.

 az webapp log tail --name <app-name> --resource-group <resource-group-name>

CLI log stream

Visit and check /LogFiles for real-time logs.
https://techcommunity.microsoft.com/blog/appsonazureblog/troubleshooting-log-stream-data-not-loadingpopulating-in-app-services/3944370
Let me know if you have any further assistances needed.