Some apps not running while Fidder capturing

[Joynson]

For example, when Fiddler Classic is open and capturing, I open Minecraft and the skin won't load or another example, it won't try to open Roblox, it crashes directly. If Fiddler Classic is open and does not capture, there is no problem, but when it does, it breaks most applications.

 

Methods I have tried:
- Deleted and reinstalled the certificates
- Deleted and reinstalled Fiddler
- Checked "Ignore server certificate errors (unsafe)"

[Nick Iliev]

Hello Joynson,

 

Roblox is not officially compatible with any system proxies, and even their official support guidelines suggest that Roblox can only work if your system does not use a system proxy

https://en.help.roblox.com/hc/en-us/articles/203552894-General-Roblox-Studio-Issues (in this support thread, they are not providing a solution to use a proxy but are instead instruct users to remove the proxy)

That said, Fiddler Classic acts as a system proxy when capturing, which explains why you can't use applications that do not respect the Windows proxy settings.

 

Regards,
Nick Iliev
Progress Telerik

[Joynson]

No, that wasn't the problem but never mind. I solved the problem, now I have another problem. I downloaded Roblox from the Windows Store and in this WinConfig place I selected Roblox so I can see the incoming requests (or should I say tasks, I only know how to use the program, I don't know anything about what's going on here, I don't even know what https stands for).

Anyway, I used to cheat in this game through Fiddler Classic, I used to select a game in Roblox and then after seeing the "gamejoin.roblox.com" thing, I would click on that request, put a breakpoint and in the request I would change my name in the game.

"UserName": "Test123" like this. Actually it used to be at the top, Inspectors > TextView, but now it's in the request section because then Roblox tried to figure out a way to protect it and it seems to be still protected because every time I try to change my name the game gives me an error. Is there still something I can do or should I give up? Thanks.

 

Edit: Oh and I tried to change the https protocols but again the game gave me an error. You know, tls1.0, 1.1, 1.2 or something.

[Nick Iliev]

It appears that Roblox has modified their internal logic for creating request headers and bodies, which has caused your previous custom solution to fail. Unfortunately, we are unable to test the situation ourselves due to corporate policies and legal considerations, so it is challenging to offer specific guidance. However, we recommend investigating how the Roblox server API interacts with the Roblox client application and examining any error messages received when attempting to alter an HTTP request header or body.

[Joynson]

Okay, thanks.