Why can't I get on any minecraft server?

I don't know what the issue is but I can't seem to get on any server. When I try to get on a server it takes a long time and then this pops up. Io.netty.channel.ConnectTimeoutException… Connection timed out. I'm on a mac, I've turned my firewall off and I'm pretty sure it isn't that. I've tried getting on servers on other computers but none work for my account. I've tried on 1.7, 1.8 and 1.9 none of them are working.

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