This is a migrated thread and some comments may be shown as answers.

ADFS Authentication Fails only when using Fiddler

1 Answer 74 Views
Windows
This is a migrated thread and some comments may be shown as answers.
Patrick
Top achievements
Rank 1
Patrick asked on 16 Apr 2019, 01:06 PM

I have a single ADFS server that is part of an Active Directory domain.  I'm having an issue with a Federated application and have turned to Fiddler to troubleshoot (as I have done in the past) and all of a sudden I'm seeing a strange issue that wasn't happening before.

I'm using fiddler on an administration desktop, so I log on with an admin account, this means when I try to use SSO for a federated app, when I hit ADFS it prompt for authentication.  Normally, great no problem, I put in my normal username / password (not the admin account I'm logged on with) it authenticates and off I go to the federated app.  This has been working fine for sometime but then recently its started to fail. It never accepts my username / password, just keeps 401, 401, 401, prompting me for username / password again and again.

I know my username / password are fine as I use them every day to log onto my desktop AND it only fails when I have fiddler open. If I close fiddler, I get prompted, enter my creds and it works fine.

It also doesn't matter what browser I use.

Does anyone know what this is? Or know how I can troubleshoot it / gather more info?

 

Patrick

 

 

 

1 Answer, 1 is accepted

Sort by
0
Simeon
Telerik team
answered on 19 Apr 2019, 08:19 AM
Hi Patrick,

You have to track down what have changed in the whole picture when the ADFS authentication started to fail. It could be an update/modification of the ADFS server, the SSO process, the federated app, Fiddler, FiddlerScript, AutoResponse rule, expired cookie, a client certificate renewal etc.

Regards,
Simeon
Progress Telerik
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
Tags
Windows
Asked by
Patrick
Top achievements
Rank 1
Answers by
Simeon
Telerik team
Share this question
or