Fiddler Everywhere 5.21.0 "Fiddler.WebUi is tampered" error on Fedora 41, works on Fedora 37.

[Ivor]

fiddler-everywhere-5.21.0.AppImage runs successfully on a Fedora 37 workstation. On a Fedora 41 workstation it throws a System.TypeInitializationException and reports " Fiddler.WebUi is tampered" and fails to start the server.:

09:08:37.489 › Trying to start server at port [16197].
09:08:37.617 › Server error log during start: Unhandled exception. 
09:08:37.632 › Server error log during start: System.TypeInitializationException: The type initializer for '<Module>' threw an exception.
 ---> System.Exception: Fiddler.WebUi is tampered.
   at MaoFcf2Vq4taIANM6n.hIDAYxH6DWLHIthQgC.zSLipEDdx()
   at .cctor()
   --- End of inner exception stack trace ---

The checksum on the AppImage file is the same on both FC37 and FC41 workstations. It fails on a clean FC41 installation as well as on another system that was upgraded from FC38 to FC41. Full "script" log attached. Am I missing some preparation or is this a bug?

[Nick Iliev]

Hello Ivor,

 

Thank you for bringing this issue to our attention and for providing the technical details and logs. I can confirm that we were able to fully reproduce the behavior while using Fedora 41 Workstation. We have logged it as a bug in the following public GitHub thread, which you can use as a reference: https://github.com/telerik/fiddler-everywhere/issues/51. 

 

We will update the linked thread as soon as we have more information about potential solutions or upcoming fixes.

 

Regards,
Nick Iliev
Progress Telerik