network connected, but no internet

I tried to find my issue several days, here and on internet but I couldn’t, so I opened this new topic.
I installed Comodo Free Firewall on my laptop, so at home i can surf on interne. However, when I bring my laptop to the work, it can be connected to the net work but i can’t surf on internet by Firefox or Chrome.

The connection type at home ant work is wireless.

One more thing is that I have avira with web protection active on my computer as Antivirus.