VPN works fine on Wifi but not on ethernet
Hi guys, I am staying in a dorm now and I have encountered a strange issue with my VPN connection. I am a Nord VPN user; when I connect to the wifi in my dorm, the VPN works perfectly fine. But when I connect my MacBooks and iPad to ethernet, for some reason, I cannot connect to Nord VPN. I have tried all VPN protocols, disabled Cybersec, added Nord VPN to trusted software in my Mac firewall.... none of these help.
Wi-Fi provider: Glide Students
Note: When my MacBook is connected to Ethernet, the system software update shows "Unable to check for updates: Make sure you are connected to the internet." The strange thing is that my MacBook is definitely connected as I am able to browse the web and download stuff. It appears that part of the mac os system is not recognizing the ethernet connection.