Fiddler web debugger crash error "A new guard page for the stack cannot be created"

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Fiddler Classic
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jason asked on 15 Feb 2022, 04:09 PM

Ive been getting this error about once a day and fiddler will crash. Im stuck on this and have no more ideas what i can do. 

im trying fiddler classic ( also might be called fiddler 4? im not sure)


Progress Telerik Fiddler Web Debugger

v5.0.20204.45441 for .NET 4.6.1
Built: Tuesday, November 03, 2020

64-bit AMD64, VM: 110.0mb, WS: 141.0mb
.NET 4.8 WinNT 6.1.7601 SP1



Any ideas?


Nick Iliev
Telerik team
commented on 17 Feb 2022, 08:35 AM

You are using an old version of Fiddler Classic that is no longer supported. Please update to the latest version available from the official download link: 

No answers yet. Maybe you can help?

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