Web Apps suddenly stoped by 'jpegtran: can't openjpegtran: can't open' error

Question

My Web Apps Site is stoped this morning. In application log,

jpegtran: can't open D:\home\site\wwwroot\wwwroot\images2\aozora??????_1F.jpg for reading

Unhandled Exception: System.ArgumentNullException: File name cannot be null.

The Japanese file name seems to be the cause of the error, but it wasn't a problem until last week. Has anything changed in the service?

Answer 1

I understand the issue started a week before, is this issue confined only to accessing this aozora*??????*_1F.jpg file name or any .jpg images?

 You may leverage App Service diagnostics from Azure Portal> Navigate to your App Service app in the Azure Portal. (screenshot below)

 In the left navigation, click on Diagnose and solve problems - Review and run –“Configuration and Management”  and “Availability and Performance”.

Enable and review logs to fetch more details about the error -here - Access log files - to fetch more info about the error.

If you haven't done this already, restart your WebApp and then check if it helps.

App Service diagnostics*

Kindly let us know, I'll follow-up with you further.