While hosting an application that we use Puppeteersharp on IIS, I get a 407 error. I make the relevant proxy settings, but I still keep getting the same error.

I tried each of the settings in the picture, but the result did not change. I'm sure the username and password are correct.
When I run the application exe, it goes to the internet without being connected to the proxy, but IIS does not come out either.
How do i solve this problem?
I faced the same problem. This is probably caused by the puppeteersharp library that is running under your project. The library may be going to another url to configuration some settings. So the proxy server may be blocking these urls. You can detect this url and allow it. I couldn't solve the problem then i changed my library as selenium. This solve my problem in IIS.