Hello, it seems like there are a few ways to configure fiddler to chain to an upstream proxy, but none of the instructions i found mentioned what to do when you are using a setup script for the proxy. Is there a way to still configure fiddler to chain to the upstream proxy in this case? 

https://vimeo.com/758966052

Pleas take a look at video above here.

I compare between fiddler classic and echo mirage and i want to know why fiddler can't capture it? and how to fix this. (fiddler classic can capture http(s) normally)

I can capture traffic, decrypt HTTPs from web browsers and other applications with Fiddler just fine.

But with this app, Fiddler doesn't see anything. Tried options like adding protocols,  checking ignore cert errors, even tried tried turning off HTTPS decryption. No difference, just nothing.

With Wireshark. I can see the SSL/TCP traffic.

Here's the app link (You can register for free with junk email to login via app)

https://tinyurl.com/4yd3e94r

Please help

 

Question

I want auto close tabs.

I'm every times doing this steps.

1. Launch Fiddler Classic
2. Close these tabs(Click mouse middle button to close)

• Fiddler Orchestra Beta
• Log
• Timeline
• Get Started
• Statistics
• Auto Responder

3. Start using Fiddler Classic

I'm tired.
I'm doing this about 1 year ago.

So, I want auto close tabs.

It is possible?
How can i do it?

Thank you.

Environment

• Windows 11 64bit
• Fiddler Classic: v5.0.20211.51073 for .NET 4.6.1

For example:

In the session, Host is 'www.aaa.com', URL is '/bbb/ccc?ddd'

I want to save this www.aaa.com/bbb/ccc?ddd to a local txt file,  so I run to fiddler script/ onBeforeResponse part,  save oSession.fullUrl to a local file.

But what I get is 'www.aaa.com:443'. I wonder how to save what I need with script, now it seems to omit the URL part and add '443' instead.

Hello, how can I configure Fiddler Classic, so that only one URL appears? since two identical URLs appear to me, but I only want one to appear, how can I configure it?, thanks.

 

Hi,

When anyone try to download fiddler classic and access this page: https://www.telerik.com/download/fiddler you force the user to enter email address.

This is not UE GDPR compliance

HI:

I'm try to use fiddler as reverse proxy ,and i Write a FiddlerScript Rule like this

if (oSession.host.toLowerCase() == "192.168.5.201:8889") oSession.host = "pubs.acs.org";

then i try access https://192.168.5.201:8889 , I get this:

 i know this is because cloudflare detective it as a ddos attack.

Does it possible to solve this problem?

Afternoon folks...

I have an application that keeps sending DNS traffic over HTTPS and ultimately fails because it resolves as external where it should be internal. So I'm tracing it down using Fiddler. The application is spawned by Edge WebView2 and I can see the requests to Google and CloudFlare over :443 for DNS (through WireShark). What is very odd, is when I am running Fiddler the application never fails. So I'm trying to understand what Fiddler does while it's capturing so I can pick it apart and see which bit is making this work.

I know it uses WPAD for a bit of its operations too, I have that enabled on my machine now too. I killed DoH on my laptop too as well as Secure DNS in Edge/Chrome.

Anyone know the innerworkings of Fiddler (obviously not at an intellectual property level) but more what is it doing while it's running.

I have a client shipping application that interfaces with a server. The server then communicates with FedEx.com web services. The communication works fine but I need to analyze the web service communications (request & response) to troubleshoot a problem in the application. I am using Fiddler Classic installed on the Windows Server 2019 application server. I have followed the document on configuring for HTTPS.

When I start capturing, Fiddler shows only HTTP transactions, no HTTPS. I see a HTTP transaction Tunnel to ws.fedex.com:443 but not HTTPS transactions. The shipping application will display an error stating "An error occurred while making the HTTP request to https://ws.fedex.com/web-services/." 

Attached is a screenshot showing captured and HTTPS configuration.

The Fiddler log shows
15:59:56:3692 Progress Telerik Fiddler Classic Running...
15:59:56:3848 Windows 8+ AppContainer isolation feature detected.
15:59:56:3848 Fiddler.Network.AutoProxy> AutoProxy Detection failed.
15:59:56:3848 AutoProxy failed. Disabling for this network.
15:59:56:6035 fiddler.network.https> HTTPS handshake to www.fiddler2.com (for #1) failed. System.IO.IOException Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. < An existing connection was forcibly closed by the remote host


16:00:07:7907 HTTPSLint> Warning: ClientHello record was 347 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
16:00:07:7907 Assembly 'C:\Users\Latitude\AppData\Local\Programs\Fiddler\CertMaker.dll' was not found. Using default Certificate Generator.
16:00:07:8219 /Fiddler.CertMaker> Using .‰+˜ for certificate generation; UseWildcards=True.
16:00:08:0250 [Fiddler] No HTTPS request was received from (w3wp:3636) new client socket, port 51113.
16:00:43:0082 [Fiddler] No HTTPS request was received from (w3wp:3636) new client socket, port 51117.

I checked Tools > WinINET Options > LAN Settings while Fiddler is "Capturing". It is  127.0.0.1:8888 

I tried overriding chaining to the system default proxy by setting Manual configuration in the setting the Tools > Options - Gateway tab http & https to 127.0.0.1:8888. That caused a different problem.Setting it to the IP address still did not work. The application error was " Could not establish trust relationship for the SSL/TLS secure channel with authority 'ws.fedex.com'." . 

The Fiddler log was:
16:52:21:8478 fiddler.network.gateway.connect>Connection to 172.17.3.232 failed. No connection could be made because the target machine actively refused it 172.17.3.232:8888. Will try DNS Failover if available.
16:52:32:8162 fiddler.network.gateway.connect>Connection to fe80::c9b2:e9db:ff6b:5d95%9 failed. No connection could be made because the target machine actively refused it [fe80::c9b2:e9db:ff6b:5d95%9]:8888. Will try DNS Failover if available.
16:52:33:8475 fiddler.network.gateway.connect>Connection to 172.17.3.232 failed. No connection could be made because the target machine actively refused it 172.17.3.232:8888. Will try DNS Failover if available.
16:52:33:9099 WinINET Registry change detected. Verifying proxy keys are intact...
16:52:42:0660 HTTPSLint> Warning: ClientHello record was 347 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
16:52:42:2534 [Fiddler] No HTTPS request was received from (w3wp:3636) new client socket, port 52666.

Hoping some one can help,

Leo Zipper