Galaxy s5 thinks it's connected to wifi when it isn't

It says I have full signal strength and am connected to wifi when I'm at school, but if I go to actually use the internet it just hangs.   Old S3 worked fine.

Forgetting and retrying does nothing to help. 

I tried changing the Gateway IP and DNS, and then it gave me an error message that the internet wasn't working.

What else can I try?

This is a big problem because the school is a cell service black hole, all the buildings block signal.  

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  • Call your school IT HelpDesk. They know how to configure devices for their network. I know, because I work in IT wireless networking at a University.

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