Questions on Fiddler Forum

1 answer

796 views

A website only works when Fiddler is active

I have a website that sent an error message: "err_connection_aborted" when I connect to it using HTTPS.

When I have Fiddler active it works perfectly, so I'm not really able to debug the issue.

I've been fighting this error for several days... should be very easy, it's just a webpage under HTTPS. It works OK in HTTP, but something goes wrong with HTTPS.

Thanks!

Fiddler Classic

answered on 07 Jul 2022

1 answer

1.3K+ views

Problem when trying to monitor http(s) requests of Ubuntu on Windows 10

I am a new Fiddler classic user on Windows 10. I can easily monitor http(s) requests of my browsers such as Chrome or Microsoft Edge. However, no http(s) requests are seen from my Application "Ubuntu on Windows". I have checked it (exemted) in WinConfig toolbar. What could be the problem here. Thanks in advance!

Fiddler Classic

Fiddler Everywhere

Linux

answered on 05 Jul 2022

2 answers

1.4K+ views

Understanding server response time correctly

I ran a trace from a handheld device to a server in a data center. In short, the trace reads:

- ClientConnected: 12:44:55

- ServerConnected: 12:50:39

- ServerBeginResponse: 12:50:51

Does this mean that the Server spent 12 seconds data processing before responding?

Fiddler Classic

answered on 04 Jul 2022

1 answer

215 views

Expected that session save would include the comments

this is a feature proposal. With comments made by user, we can easily trace back the session after saving lots of sessions.

Fiddler Classic

Fiddler Everywhere

answered on 01 Jul 2022

0 answers

403 views

The url obtained with fiddler cannot return the correct json format file

The url captured by fiddler can send instructions through the software's own composer and return the correct json file.

However, the correct result cannot be obtained under the requests of python, and it will prompt:

{"Message":"Cannot convert object of type \u0027System.String\u0027 to type \u0027Carpa.Web.Script.HashObject\u0027","StackTrace":" in Carpa.Web.Ajax.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer)\r\n at Carpa.Web.Ajax.WebServiceMethodData.StrongTypeParameters(IDictionary`2 rawParams)\r\n at Carpa.Web.Ajax.AjaxHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary `2 rawParams)\r\n at Carpa.Web.Ajax.AjaxHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}

The code is as follows: ("..." means omitted information, the headers are consistent with the information in the fiddler software)

from urllib import response
import requests
import json
url = "http://......Web.Script.DataService.ajax/GetPagerDataEx"
headers = {
"Accept":"*/*",
"Referer":"...",
"Accept-Language":"zh-Hans-CN,zh-Hans;q=0.8,en-US;q=0.5,en;q=0.2",
"Content-Length":"...",
"Content-Type":"application/json;charset=utf-8",
"X-ClientType":"SLJson",
"X-JSONFormat":"true",
"Accept-Encoding":"gzip,deflate",
"User-Agent":"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; Tablet PC 2.0)",
"Host":"...",
"Pragma":"no-cache",
"Cookie": "...",
"Connection": "keep-alive"
}
data = {
"pagerId":"$......$ptypeDataSource",
"queryParams":"null",
"orders":"null",
"filter":"null",
"first":"...",
"count":"...",
"isFirst":"false"
}
data = json.dumps(data)
response = requests.post(url=url,data=data,headers=headers)
content = response.text
print(content)

Hope that helps, thanks!

Extensions and Customization

Fiddler Classic

Fiddler Everywhere

asked on 26 Jun 2022

1 answer

141 views

There are problems with the securiy cerificate for this site

Hello
I am Using Fiddler and Nox Player.
But when ever i try to connect to a website i will get this many errors and in fiddler with 443 on sites

How Do i Fix that?
I already tried
To Reset and re install the cert but didnt work.
any other solutions?

answered on 23 Jun 2022

1 answer

430 views

BCCert can't make certificates resulting in Https requests not being captured

As the title says BCCertMaker can't make certificates

I am on Manjaro Linux and using Mono 6.12 and am using Fiddler to capture IOS 15 requests

19:53:46:8198 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:46:8534 Fiddler.BCCertMaker> Failed to create certificate for *.gc.apple.com: Operation is not supported on this platform.
  at BCCertMaker.BCCertMaker.CreateCertificateFromCA (System.String sCN, Org.BouncyCastle.X509.X509Certificate caCert, Org.BouncyCastle.Crypto.AsymmetricKeyParameter caKey) [0x00377] in <186d138a6ba64111bc4131af9c9cbf93>:0 
  at BCCertMaker.BCCertMaker.MakeNewCert (System.String sHostname) [0x00102] in <186d138a6ba64111bc4131af9c9cbf93>:0 
19:53:46:8534 fiddler.https> Failed to obtain certificate for stats.gc.apple.com due to Certificate Maker returned null when asked for a certificate for stats.gc.apple.com
19:53:48:6149 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:48:6510 Fiddler.BCCertMaker> Failed to create certificate for *.apple.com: Operation is not supported on this platform.
  at BCCertMaker.BCCertMaker.CreateCertificateFromCA (System.String sCN, Org.BouncyCastle.X509.X509Certificate caCert, Org.BouncyCastle.Crypto.AsymmetricKeyParameter caKey) [0x00377] in <186d138a6ba64111bc4131af9c9cbf93>:0 
  at BCCertMaker.BCCertMaker.MakeNewCert (System.String sHostname) [0x00102] in <186d138a6ba64111bc4131af9c9cbf93>:0 
19:53:48:6510 fiddler.https> Failed to obtain certificate for news-edge.apple.com due to Certificate Maker returned null when asked for a certificate for news-edge.apple.com
19:53:48:7116 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:48:7477 Fiddler.BCCertMaker> Failed to create certificate for *.apple.com: Operation is not supported on this platform.
  at BCCertMaker.BCCertMaker.CreateCertificateFromCA (System.String sCN, Org.BouncyCastle.X509.X509Certificate caCert, Org.BouncyCastle.Crypto.AsymmetricKeyParameter caKey) [0x00377] in <186d138a6ba64111bc4131af9c9cbf93>:0 
  at BCCertMaker.BCCertMaker.MakeNewCert (System.String sHostname) [0x00102] in <186d138a6ba64111bc4131af9c9cbf93>:0 
19:53:48:7478 fiddler.https> Failed to obtain certificate for news-edge.apple.com due to Certificate Maker returned null when asked for a certificate for news-edge.apple.com
19:53:50:0979 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:50:1347 Fiddler.BCCertMaker> Failed to create certificate for *.icloud.com: Operation is not supported on this platform.
  at BCCertMaker.BCCertMaker.CreateCertificateFromCA (System.String sCN, Org.BouncyCastle.X509.X509Certificate caCert, Org.BouncyCastle.Crypto.AsymmetricKeyParameter caKey) [0x00377] in <186d138a6ba64111bc4131af9c9cbf93>:0 
  at BCCertMaker.BCCertMaker.MakeNewCert (System.String sHostname) [0x00102] in <186d138a6ba64111bc4131af9c9cbf93>:0 
19:53:50:1347 fiddler.https> Failed to obtain certificate for gateway.icloud.com due to Certificate Maker returned null when asked for a certificate for gateway.icloud.com
19:53:50:2913 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:50:2921 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:50:2928 HTTPSLint> Warning: ClientHello record was 508 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
19:53:50:3244 Fiddler.BCCertMaker> Failed to create certificate for c.apple.news: Operation is not supported on this platform.
  at BCCertMaker.BCCertMaker.CreateCertificateFromCA (System.String sCN, Org.BouncyCastle.X509.X509Certificate caCert, Org.BouncyCastle.Crypto.AsymmetricKeyParameter caKey) [0x00377] in <186d138a6ba64111bc4131af9c9cbf93>:0 
  at BCCertMaker.BCCertMaker.MakeNewCert (System.String sHostname) [0x00102] in <186d138a6ba64111bc4131af9c9cbf93>:0 
19:53:50:3245 fiddler.https> Failed to obtain certificate for c.apple.news due to Certificate Maker returned null when asked for a certificate for c.apple.news
19:53:50:3245 !Certificate cache didn't find certificate for [c.apple.news]. Returning null to thread #66.
19:53:50:3245 !Certificate cache didn't find certificate for [c.apple.news]. Returning null to thread #65.
19:53:50:3245 fiddler.https> Failed to obtain certificate for c.apple.news due to Certificate Maker returned null when asked for a certificate for c.apple.news
19:53:50:3245 fiddler.https> Failed to obtain certificate for c.apple.news due to Certificate Maker returned null when a

EDIT: It also seems like HTTPS requests are being sent like http://example.com:443/

Fiddler Classic

Linux

answered on 21 Jun 2022

2 answers

2.6K+ views

Fiddler messing with my pc internet Help I'm completely lost. (NOOB)

I am completely new at this fiddler thing and I have no idea what it does. I just know that I can't connect to anything without having fiddler on otherwise it just keeps loading and says I cannot connect to the internet. I used it to find a value in a game and I am stuck using fiddler to just gain access to the internet. I uninstalled it and everything and it will not go back to the way it was. I want nothing to do with this program anymore I just want my pc back for everyday use without having to launch fiddler every time to connect to discord or steam or the internet etc. I have tried checking and unchecking "capture https CONNECTs" many times. I have reset all certification multiple times. I have also went in a deleted all the ones from fiddler and nothing changed. I also know if I don't use "act as system proxy on startup" I cannot access the internet. Thanks.

Fiddler Classic

Fiddler Everywhere

answered on 14 Jun 2022

0 answers

790 views

Can't install and open Fiddler Classic.

Hi, first of all, I must warn you that I am a beginner in general computing so if you can help me with a solution, please make it basic. Thanks.

When I try to install Fiddler Classic, halfway through the download, a command line will pop up.

After about 2-5 seconds, the command line will close and a warning message will appear.

I cannot copy and paste the command line popup as it closes too quickly, but I do have a screenshot of it.

The warning message cannot be selected or copied so I will also attach a screenshot of that too.

As the warning says, I have added the installation directory to the PATH environment variable, but it does nothing.

I may be doing something wrong, but as a non-advanced computer guy, I can't tell.

I have tried to install Fiddler Classic on another computer and no warning or command line popped up, but for reasons, I cannot use that specific laptop. However, this means it is on my end. I have tried reinstalling many times before, to no avail.

Help would be welcome.

Thanks in advance,

Bobby

Fiddler Classic