Hello. I have an application. But Fiddler doesn't capture all requests of my application. It doesn't capture few requests. But Fiddler works fine in browsers like Chrome and Firefox. I tried Wireshark for same application, and it captured the requests that Fiddler couldn't capture. And, these "uncaptured" requests are HTTPS. I have enabled HTTPS Decryption. I need full URL and response data of these requests. Can you help me please? I apologize for my English.

I've read Eric Lawrence's great blog post (https://www.telerik.com/blogs/help!-running-fiddler-fixes-my-app-) on the most common classes of issues "fixed" by running Fiddler. I seem to have another example.

I'm investigating an issue for a client where SignalR connections (over websockets) are dropping out regularly every hour. The dropouts are affecting roughly half the machines in their network, and happen after a connection has been up for an hour (i.e. not all machines are dropping out at the same time). The machines are heavily locked down windows 10 running Chrome in kiosk mode and are (in theory at least) identical builds. The dropouts have started happening as the client sites have moved to a new network provider - but only affecting about half of the sites. All sites have (in theory at least) identical network configurations.

To try to learn more about the cause of the dropouts (specifically whether it is a difference in the clients or a difference in the network) I have been running Fiddler on a machine that does experience the dropout. However, the dropout stops happening while Fiddler is running and resumes once Fiddler has stopped.

The dropouts happen whether or not there is application traffic occurring on the SignalR connection. Overnight there may be periods of several hours where the only traffic on the connection is the websocket-level keep-alive (ping/pong) and the SignalR level heartbeat ("type":6 messages). The devices experiencing the issue drop out once per hour, 24 hours per day.

Can you think of any possible way(s) in which Fiddler can be influencing the behaviour that would cause the dropouts to stop?

 

Thanks
Richard

 

Hi Team,

I am having issues when running Fiddler in order to analyze the traffic that is made between Office 365 apps and authentication service from Microsoft.
Basically when Fiddler in running in non-browser mode and after I sign out from Word and want to sign in again I am getting error 0xCAA70004 which indicates there's no internet. The intranet pages are also affected as they don't load. We got a proxy setup. I did setup a proxy server settings in LAN settings on IE however I still get the same result. I did set the proxy settings manually in Fiddler under the tools>options>Gataway and checked under "show current gateway Info" which shows our proper proxy details. Still I cannot get any of the office apps to authenticate. Act as system proxy is enabled under the Connections tab and the Root certificate is enrolled. Decryption from HTTPS in enabled and set to "from all processes". Protocols are set for tls1.1 and tls1.2
Can you please advise how to fix this issue?Should Fiddler be bypassed for Office 365?

Many thanks in advance for the advice and reply.

We are attempting to use Fiddler as a proxy to capture traffic being sent from Microsoft Dynamics NAV to SharePoint via a plugin we have written for NAV. 

I have added the below to    "C:\Program Files\Microsoft Dynamics NAV\90\Service\Microsoft.Dynamics.Nav.Server.exe.config"

 

<defaultProxy>
      <proxy autoDetect="false" bypassonlocal="false" proxyaddress="http://127.0.0.1:8888" usesystemdefault="false" />
 </defaultProxy

 

When our plugin (DC.SharePoint.ComWrapper) attempts to connect to SharePoint via Fiddler we receive the below error.

 

Microsoft Dynamics NAV
---------------------------

A call to DC.SharePoint.ComWrapper.ListItemWrapper.Create failed with this message: The remote certificate is invalid according to the validation procedure.
---------------------------
OK
---------------------------

Does anyone have any suggestions as to what I could be missing? The NAV service runs as a domain user, which has the Fiddler root certificate in it's trusted root certification authorities store.  I have also tried putting it in the local computers store and running the service in the Network Service account.

The only thing I have noticed, is in the Raw capture, there is a line saying:

"Time": 26/09/2021 02:52:10

The date and time specifieid changes to seemingly random date around 50 years either side of the date today. However I am not sure if that is being used to validate the certificate?

Any help would be greatly appreciated.

Hi team,

 

I recently downloaded Fiddler Classic and now that is downloaded, my Slack app does not connect unless the Fiddler tool is up and running. What settings do I need to change in order to have Fiddler closed and ability to use the Slack app?

 

Thanks,

Jacob

Are there settings, or bypasses, that need to be set up to get Fiddler Everywhere to launch, on a mac, behind a web gateway/proxy?

From time to time, sometimes a few times a day, Fiddler would show a yellow bar and a message "The system proxy was changed. Click to reenable Fiddler capture".
Is there a way to make the re-enabling happen automatically? 
I just want Fiddler always running so I don't have to re-enable it.

Thanks.

I am not able to capture the localhost request in fiddler everywhere v0.11

Dears,

I need you help~ 

 

I'm sure that I had installed the Certificates to my iPhone and trust it. and the Certificates is right

on chrome in my computer and on my android Phone,I had do that the same with iPhone,they can capture https

but,I can't capture some https on my iPhone(iOS 13.3)

my issue:

In QQMusic APP, domain is 'u.y.qq.com', I can capture it ,but can't capture https when the request's domain is 'y.qq.com' or 'y.gtimg.cn'

 

Fiddler version:v5.0.20202.18177

iPhone OS :13.3 and 13.5

 

 

this is fiddler log:

21:57:49:5504 !SecureClientPipeDirect failed: System.IO.IOException Authentication failed because the remote party has closed the transport stream. for pipe (CN=*.y.qq.com, O=DO_NOT_TRUST, OU=Created by http://www.fiddler2.com)

I want to use PAC file. http://127.0.0.1:8888/proxy.pac, this way, if my proxy accidently quits without remove the proxy setting, the browser will be able to continue to work since it can't find the pac file, thus consider it "No proxy".

 

But When I set the flags, if I don't include: "RegisterAsSystemProxy", the PAC file will not registered.

If I DO include "RegisterAsSystemProxy", the PAC file is registered, but also the proxy servers, 127.0.0.1 8888 for http and https. What's the point to have both registered, and it negate my purpose.

Anyway to hook up PAC file only?

 

Also, how to  modify the PAC file content, for GOD's sake?