FTP connection - Credentials Pop-up

2 posts, 0 answers
  1. Melih
    Melih avatar
    1 posts
    Member since:
    May 2019

    Posted 31 May 2019 Link to this post

    Hello there,

    One of my clients can access a specific ftp site successfully but she can only access there from her laptop. According to the company (which gives this ftp service), she can access it from anywhere. 

    For that, even if I am very new to Fiddler, I wanted to see what's going on behind the scenes. I enabled ftp connections to be captured via Fiddler.

    The problem is that when I open Fiddler and try to open the ftp site, it simply writes "This FTP server requires login credentials". When I close the fiddler and try to open the ftp site again, it pops up the credentials screen (which I am currently failing). 

    How can I let the credentials page to be popped-up so at least I can see what's going on?

    Thank you


  2. Eric R | Senior Technical Support Engineer
    Eric R | Senior Technical Support Engineer avatar
    397 posts

    Posted 07 Jun 2019 Link to this post

    Hi Melih,

    My sincerest apologies for the delayed response. Unfortunately, Fiddler doesn't have an authentication UI and the credentials would need to be included in the request.

    The convention for passing username and password over ftp is below. I should caution that this method is insecure and Fiddler will only listen for ftp traffic. If you want to secure your file transfers you will need to use sftp or ftps which do not work with Fiddler at this time.

    Username and Password Convention


    You can also use the composer in Fiddler to test this out. Below is output from my testing.

    401 Request

    200 Request

    Please let me know if you have any additional questions.


    Eric R
    Progress Telerik
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