Direct Proxy with internal webserver

Hi,

first, i know it is a special configuration. But actually we need this working for the next months.....
Later we move on to transparent proxy and for sure the issue will be gone :)

At the moment we have a direct proxy configuration

Rule on Sophos XG:
Lan -> Wan / TCP Port 3128

Everything outside is working as expected.
If we try to open a webpage on the inside interface we get an timeout.
We dont have the ability to set an exception für internal websites.

So perhaps someone has an idea what i am missing to allow the webproxy sending requests to internal webservers.
if i do an wget on the shell, i can reach the webserver, so there are no dns issues.

Br

Benny