I can access the url below, but the portal is empty and nothing is shown:       After one minute I got redirected to the below page:   would you please help

Hello community,we are planning to install the SNTC collector for Solarwinds NCM, there is a firewall between the NCM and the internet, my question is, what port/flows that we need to allow in the firewall in order to establish the SNTC connectivity....