Outlook 356 App and Fiddler Classic

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Fiddler Classic
Shaylin
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Shaylin asked on 13 Dec 2023, 06:28 PM

My client said that they are having issues with Outlook 365 via the local Outlook app when Fiddler is also open/running.

 

The client goes to open outlook and it just sits and spins and never opens. But as soon as she closed out of Fiddler, she was able to open email no problem. They have even had to reboot their computer in order to open Outlook. 

 

See attached for how I have their settings set up.

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Nick Iliev
Telerik team
answered on 14 Dec 2023, 09:11 AM

Hello Shaylin,

 

There is an issue with some Microsoft applications, including the Office365 apps, where they do not respond to changes in the system proxy. This means that these applications won't work when the system proxy settings are updated, not only from Fiddler but from any other tool that modifies the system proxy. One possible solution is to bypass the Office365 applications by using the Fiddler proxy. To do this, go to Tools > Options > Connections > Bypass Fiddler for... and add the Office365 API endpoints (you can them in the Office365 site or refer to this documentation article for Fiddler Everywhere and apply the listed endpoints in the bypass list in Fiddler Classic).

 

Regards,
Nick Iliev
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Shaylin
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Nick Iliev
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