Connected to public wifi no internet access,open

Hello, I can't log into my local library public network I can usually log in today it says I'm connected but there's no internet,open

I really need to do my work and I've run cmds I've pinged the server and it keeps saying timed out .
I've switched off my firewall nothing I've restarted my laptop nothing.
Everyone se device can connect other then mine.

Please help