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Changed IE behaviour when Fiddler is installed

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peter
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peter asked on 17 Jun 2014, 10:42 AM
Hi,
I installed Fiddler on my PC to debug a communication issue between my PC running an ordering application through IE8 (same issue with IE11) and an external catalog application. The strange thing is that when Fiddler is installed, the application is working correctly. On PC's where Fiddler is not installed, we get error messages. As soon as we install Fiddler, the application works perfectly.
‚ÄčThe issue manifests itself with the user not obtaining an automated logon to the web site via the OCI 4 interface when using the standard IE8 browser settings. When Fiddler is installed, the issue disappears.
Any idea what behavior Fiddler could change to make this working?
Thanks in advance for your support.
Peter

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Eric Lawrence
Telerik team
answered on 17 Jun 2014, 04:03 PM
Hi, Peter!

This post: http://blogs.telerik.com/fiddler/posts/13-02-28/help!-running-fiddler-fixes-my-app- explains the most common scenarios in which Fiddler "magically" fixes a site just by running Fiddler.

It sounds like you might be saying that Fiddler isn't even *running*-- it's just installed? If that alone helps, it's either a coincidence, or someone had unchecked the default setting of "Use HTTP/1.1 through proxy servers" setting inside IE's Tools > Internet Options > Advanced. (That's the only change to the browser that Fiddler makes upon install.)


Regards,
Eric Lawrence
Telerik
 

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Eric Lawrence
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