Hi! I've started building a native Mac client to view Fiddler traces. I'm still in the early stages and I was wondering if there was any interest out there. I'd love to get some beta testers and early feedback. 

Thanks!

@dt_weston on Twitter

Hi All, I hope someone can help!

On a Windows 10 machine, I installed and ran the latest Fiddler version (v4.6.3.44034) and was able to successfully capture and decrypt HTTPS sessions using the proxy server.

Now, I am trying to return to normal operations, running without the proxy server.  One of the sites requires a client side certificate be attached to the request and this request now fails with error -2146233079 (The request was aborted: Could not create SSL/TLS secure channel).

This was working just fine prior to the Fiddler install, under the current user, not the admin account.  Fiddler was also installed under the same current user.

If I run the application as Administrator, it works.  So, how do I undo whatever permissions change that was made by Fiddler which prevents me from accessing the client side certificate that I had no problem accessing before?

I have tried the following so far:

1) Fiddler Options > HTTPS > Remove Interception Certificates

2) Fiddler Options > HTTPS > Rest All Certificates

3) Uninstalling Fiddler entirely

Thank you!

When clicking in the top menu, eg File - nothing happens.

terminal shows the following output:

Fontconfig warning: ignoring UTF-8: not a valid region tag
Wi-Fi
/Users/xxx/dev/fiddler/FiddlerAttach.applescript:7:87: execution error: /bin/sh: /Users/xxx/dev/fiddler/attach.sh: Permission denied (126)
Fontconfig warning: ignoring UTF-8: not a valid region tag

Hello Support,

I have a problem with Fiddler v4.6.3.44034 while recording a session against a https-Server.

The following exception is recorded in the log:

23:00:10:3693 Automatic authentication of Session #659 was unsuccessful. System.NullReferenceException Object reference not set to an instance of an object.
   at Fiddler.Session.ž() in c:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\Session.cs:line 4353

The corresponding request is returing a 502 with the following response text:

[Fiddler] The connection to the upstream proxy/gateway failed. Closing Fiddler,
changing your system proxy settings, and restarting Fiddler may help.
System.Exception Upstream Gateway refused requested CONNECT. 407

Trying QuickExec  prefs set fiddler.composer.HTTPSProxyBasicCreds username:password does not help.

Do you know a solution for this issue?

Thanks 

Frank

Hi,
I have a problem capturing https traffic of my iPad remotly through a proxy on my PC.

I have fiddler installed on a Windows 7 machine. I have also installed the cert maker and generated a new
certificate which I have installed on the ipad.

When I open http websites i can see all the traffic. But when I try
to open https websites or apps using https the iPad cannot open the site
or use the app because of network issues. What is wrong? I followed
this instruction on multiple ios devices and recording pcs, but no https
traffic :(
http://docs.telerik.com/fiddler/configure-fiddler/tasks/ConfigureForiOS

Hi,

I am new to Fiddler, I am trying to capture traffic using Fiddler to do performance testing, to export sessions to Visual Studio Webtest. I could not get the Header information from Fiddler, I tried to solve it by trust Fiddler certificate but I could not, the solution I used are:

http://www.telerik.com/forums/some-https-sites-are-unaccessible-when-using-fiddler

http://www.telerik.com/forums/unable-to-decrypt-https-traffic

Also I get the session on Fiddler as the following with grey color which I could not get the headers information:

# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
7 200 HTTP Tunnel to pluralsight.hb.omtrdc.net:443 0 chrome:1908
9 200 HTTP Tunnel to pluralsight.hb.omtrdc.net:443 0 chrome:1908
10 200 HTTP Tunnel to pluralsight.hb.omtrdc.net:443 0 chrome:1908
11 200 HTTP Tunnel to pluralsight.hb.omtrdc.net:443 0 chrome:1908
12 200 HTTP Tunnel to pluralsight.hb.omtrdc.net:443 0 chrome:1908

even I could not post his thread with Fiddler on.

Thanks,

Iris

On many occasions, I've found Fiddler stops working on SSL connections for no apparent reason. Chrome gives errors like 'untrusted cert authority'. It seems to happen after Windows or browser updates and I've tried every approach I could find to fix it.

I think I've finally found a reliable fix:

1. Open Windows Certificate Manager and manually delete all Fiddler certs from all folders

2. Open Fiddler HTTPS options tab, uncheck 'Capture HTTPS connects'

3. Click 'Remove Interception Certificates' in the Actions menu.

4. Restart Fiddler

5.Recheck 'Capture HTTPS connects' in Fiddler options, and reinstall the certs.

Removing all Fiddler certs in Windows Cert Manager first seems to be the key step.

Hi,

My fiddler decided to update but when I tried to start if post the update I get Could not find file 'Fiddler.resources'. If I continue It opens but nothing in the composer section. If I quit, it messes up my internet connection by setting local proxy and shutting down before resetting it.

Any ideas? Have also tried to update to the Beta version but same issue.

Uninstall and Reinstall?

I am trying to figure out why I am getting gibberish in the post body of the following post request. The following request is from an IOS app. I get similar results from the Android app too.

I do not get any security errors on the app (on iOS or ANdroid version) and everything works while I am capturing traffic. Can the post body be encrypted? or is it most likely compressed? There is an unusual header "x-Accepts: compression" Is there anyway to convert the gibberish to something readable? The responses also look similar to the request post body

POST https://api.site.com/ HTTP/1.1
Host: api.site.com
x-auth-token: TOKEN
Content-Type: application/x-www-form-urlencoded
Connection: keep-alive
X-Accepts: compression
Accept: application/json
User-Agent: APP
Accept-Language: en-US;q=1, es-MX;q=0.9
Accept-Encoding: gzip, deflate
Content-Length: 89

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My fiddler2 just force updated this morning and since then I am unable to decode incoming responses. I've searched for answers and have gotten nothing yet. Some common problems seem to be due to root certificate issues to which I have already reset. I also tried uninstalling and reinstalling. Clicking on the "Response body is encoded. Click to decode." button seems to refresh the response but it turns up the same, still encoded. Anyone here who's experienced something similar?

Attached is a GIF of me clicked "Decode" and exactly what happens afterward.