Add Source Error Local Deployement

[TeoLan24]

Hi, i want to deploy the Wingetty server on a Domain Machine, in order to installl custom packages using winget from other domain PCS.
I got stuck at the "Cannot Add Source Error"

I also tried setting a reverse proxy with njinx.

If you have time could you help me.

I read in another user question that an ssl certify is required, but what if i want to use it only on the lan machines?

Thanks!