Bad request access site

Good morning everyone, a strange thing happens to me while if I connect to the Lombardy region tax site with nethsecurity I get a response from the bad request site
while if from the same computer I connect via wifi directly to the router everything works fine
if you have any tips I thank you

Do you use threat shield?

Maybe it’s blocking the site/IP. To check if the site is listed, see It appears I'm having a little issue with Threat Shield - #8 by mrmarkuz

https://idpcwrapper.crs.lombardia.it/PublisherMetadata/SSOService
th problem is in this site
shibboleth error

I don’t know much about shibboleth SSO but it seems that some ports need to be forwarded.

From https://www.ukfederation.org.uk/library/uploads/Documents/BPG.pdf:

Network Requirements
Ports 80, 443, 8442 and 8443 need to be open in both directions for Shibboleth to work
successfully. Port 443 provides https but any port can be used instead. However, it is often
difficult to convince network people to open some other port for HTTPS traffic