Is my PC adapter broken or My school has blocked my internet?

Hi everyone.

So my PC just can't access internet anymore, but I can access to my school home page.

When I look at my PC ethernet port, the left light is solid Red and the right is blinking orange (or yellow).

At the other ethernet port at HUB, it still green normal.

So my PC ethernet adapter is broken or my school has blocked my internet connection.

Note that my school internet has proxy and my PC is Dell Vostro...and I have my windows 10 update about 2 week ago (not sure if this relate to this problem).

Thank you guys very much.