Need More Info
Last Updated: 05 May 2023 07:09 by ADMIN
Created on: 04 May 2023 19:46
Type: Bug Report
Fiddler Classic - Product Defect

Fiddler would NOT allow me to save the file.  We tried this multiple times to various file locations. 

I do not have Visual Studio installed on my PC -- so I selected the latest verison in this form because it is a REQUIRED field. 

Fiddler provided the text below. 



Awww, Fiddlesticks!


Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at


Could not find file 'C:\Users\629243897\Documents\IBMSPend on v85 debug - 2 refreshes after logon.saz'.


Type: System.IO.FileNotFoundException

Source: mscorlib

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)


   at System.IO.FileInfo.get_Length()


   at Fiddler.frmViewer.actSaveSessionArchive(String , String
, Session[] ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:line 6808



Fiddler v5.0.20211.51073 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.22621.0]




1 comment
Nick Iliev
Posted on: 05 May 2023 07:09

Hello Michael,


The inability to save a file might be caused by various reasons:

- Security group policies that restrict file saving on your machine/account.

- Lack of disk space.

- Lack of read/write privileges in the user's directory (C:\Users\629243897\Documents\).

- Third-party security tools or policies that strip the Fiddler app from administrative rights.

If Fiddler Classic is not installed with administrative rights, you can retry to reinstall it (with administrative read/write privileges).

As a side note, are you only experiencing the issue when saving a SAZ file? You could try to export a HAR (HTTPArchive) or other supported format through the application Export option.

I hope the above helps you in identifying the issue.




Nick Iliev
Progress Telerik

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