Fiddler not displaying sessions - fiddler

I've got the latest version of fiddler installed on 2 machines (v2.3.0), and on one machine it displays web sessions, and in the other it doesn't.
This is using IE and Firefox on Win7.
I have tried deleting my customrules.js and letting fiddler create a new one.
I know that the broken machine is indeed proxying traffic through fiddler, as I see the fiddler SSL cert when I go to HTTPS sites.
I have set the option at the bottom-left of the window to All Processes, Web Browser and Non-Browser to no avail. I just can't seem to get the sessions to display.
Any hints to where I should look to find out what's going wrong?
Thanks,
Kirk

In rough order of likelihood..
Ensure File->Capture Traffic is checked (obviously).
Ensure it says "All Processes" in the bottom left.
Flick to the "Filters" tab and uncheck Use Filters (I always forget this..)
Same goes for the "AutoResponder" tab.
Click the "Process Filter" button on the toolbar once to make sure it's off.
Go to Help->About Fiddler and compare the port number with IE->Options->Connections->Lan settings->Proxy server->Advanced
If that fails, uncheck the following:
Rules->Hide Image Requests
Rules->Hide HTTPS Connects
Rules->Hide 304s
To eliminate anything in the rules script, go to Rules->Customize Rules and add the following line to the end of OnBeforeResponse():
oSession.oFlags.Remove("ui-hide");
(If that fixes it, something in your rules is setting oSession["ui-hide"])
After these steps its time to think 'applicatin specific'. For example .net won't proxy for "localhost". This page has application specific tips, such as PHP, .net, Java, Win 7 phone,etc..
If all that fails, go to the Fiddler group and post a question, you'll normally get a pretty quick response from Eric Lawrence himself.
simple..

http://www.fiddler2.com/fiddler/help/faq.asp
Set the Status bar filter to "All Processes", check that the Process Filter in the toolbar isn't set, and examine the Filters tab to make sure that no rules are enabled. If you've written or set any Rules (see the menu) check those too.

I ran into this problem as well and as mentioned before it can happen because of the proxy server.
For me the problem was I was using a VPN Proxy Extension, such as Hola or Unblock Youku. So I simply turned them off.

Simply try out this
Help -> Troubleshoot Filters
And also click the 'Filters' tab and either uncheck Use Filters or modify the filter appropriately.

If the other answers don't work, right click on fiddler and select "Run as Administrator".

I just had the same issue and resolved it by ending all Fiddler processes in Task Manager by checking the Show processes from all users. Another user on the machine I use(loaner) still had a Fiddler session going. Ending that session and beginning a new one seems to have fixed the problem for me.

this worked for me but uncheck Troubleshoot not showing any sessions to me
i have no filter no rule
any process checked
all sessions checked

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Thanks to #VadimKovrizhkin for asking. Yes, I do remember now.
Step 1
(I did not try this, but it is definetely related to the problem)
Try disabling all extensions. If the checkbox is enabled, re-enable all extensions one-by-one to see which one it is. If you find which one it is, you may not need to permanently disable it.
The extension may have settings/preferences. For example, mine was an ad-blocker. I went to its preferences in my browser settings. Then, I disabled it on the specific site I wanted.
I have not tried this out on this problem though.
Step 2
If that did not work, here's what helped me enable the checkbox.
This step is very simple.
Go to the "Pages" section (or wherever the checkbox is)
Lay your cursor over the checkbox.
Right click, "Inspect Element", and go to the element manually if it doesn't automatically.
Find the attribute on the <input type="checkbox"> element called disabled.
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It looks like this issue has not been fixed yet.
I can tell because I ran into this problem a few days ago setting my domain.
I did the inspect element trick and it works great.
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Other GitHub users have had browser support issues on Firefox and Chrome (maybe other browser too).

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hope this saves you time.
As of now (2022.5), the above exceptions list no longer works. Disabling Enhanced Security feature is never an option for me.
Users should add the following sites to exceptions. Mind the [*.] wildcard, it's mandatory.
github.dev
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If you are using vscode.dev, you should add it either
vscode.dev
If you are using VSCode Web insider builds (click Switch to Insider Versions... on bottom-left ), add the following domain.
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adding github.com is not necessary, the actual workers are not running from this domain.
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Currently (07/2022) the following works for me:
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I wanted to establish a live server , and quickly came across this extension.
After installing I clicked on the Go live button on right hand side corner.
A tabs automatically opens up in chrome browser , with this error message.
I have tried doing this , with no success.
This worked for me ,
I found this solution on a Github issue thread over here.
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yes, the above answer worked for me too.
Steps to follow if You are a beginner like me:
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Make sure IE doesn't replace fiddler mock response with the cached before one:
In IE11 you can press f12 to open dev tools and refresh the page (Ctrl + R) to see all the requests sent by the browser (in Network tab).
This is how the cached response looks like :
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This is where you can find it.
People around the web have had a lot of trouble with fiddler. It turns out it is requiring a special certificate.
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