won't connect to my servers

...when i go on Minecraft and when i go to public severs it wont connect. It says can't connect to server on all of my servers and its the right version. And when i go on my other computer it works. Then i went back to my other one that doesn't work when i download it and it says play offline...
Please help me and fix the connection promblem email me when you fix it or i need to do.

and thank you