Traffic from on app is not shown (IOS)

[Maxi]

I have setup Fiddler as a Proxy on my iPhone and its working fine on nearly all apps. I can see http and https traffic. When I open websites or apps I can see the traffic and everything is working fine. BUT one specific app which if want to inspect (Mark-E) I don’t see any request while the app is working fine.

[Nick Iliev]

Hello Maxi P,

 

Fiddler can capture traffic that is going through HTTP, HTTPS, and FTP. That said, it is not clear how the app (Mark-E) is making its requests (e.g., is it using TCP at all or UDP?). It could also be using an additional security layer (e.g., like a certificate pinning), preventing a MITM attack (which Fiddler is doing).

Of course, all of the above is just speculation as we don't have enough information related to how the mentioned application is doing its communication. Let me know if you have more details on how the app is working (and specifically how the request are made) so we could investigate the case further.

 

Regards,
Nick Iliev
Progress Telerik