Traffic not being captured on server

[Luis]

Hi,

I have a 3 layer .NET application where i'm not able to capture the traffic between the frontend application server and the backend application server (both  windows server 2019 with IIS 10).

 

I opened fiddler in the frontend server, in order to capture all the requestes to the backend server and in my machine I use the application normally and I cannot see any traffic being captured by fiddler:

 

If I open the application in the frontend server, I'm able to see the html requests from the browser to the frontend server, but what I want is to capture the communication between the 2 servers.

 

I've another server, running windows server 2012 with IIS 8, where I can perfectly capture all traffic from the frontend server to the backend server.

 

Are there any issues with windows server 2019 version? I'm missing some configuration?

 

 

Any help is appeciated.

 

Regards,

LMC

 

 

[Eric R | Senior Technical Support Engineer]

Hi LMC,

Generally, Fiddler captures traffic by attaching the current user's proxy settings. If the application is running in IIS or an alternate service then this is probably running under a different user profile and may require additional configuration. In order to troubleshoot this, I recommend reviewing the blog post and performing the additional steps outlined below. 

1. Review the Capture Traffic from .NET Service blog post.

2. Confirm the recommended configurations from the blog post are configured on the Windows Server 2012 machine.

3. Configure the Windows Server 2019 machine to capture traffic from a .NET Service similar to the 2012 server.

Please give this a try and let me know the results. Thank you and I look forward to your reply.

Regards,

Eric R | Senior Technical Support Engineer
Progress Telerik

[Luis]

Hi,

 

I verified that if I run Fiddler with the user that is defined on IIS application pool, I'm able to capture all the traffic.

 

I also had a go on your suggestion (point 1.) and it didn't resolve the problem.

 

In my case what I'll do is, whenever I want to degug request, I'll start Fiddler with the user that is running the application pool.

 

Thanks for your reply Eric.

 

Best regards and keep safe.

Luis