If you are using "open to LAN" option, you may be expiriencing UPnP network discovery service issues, or maybe if you use direct connection using pre-set IP address, your IP addresses may have changed ( happens if you reboot router, or turn-off/turn-on situation etc.)
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I had the same problem on A Windows PC at my mates house.
What we did was we disabled our firewalls and tried to connect, We managed to join the Lan server.
Next we then enabled the Firewall and whent back through all of the Firewall settings and tried disabliling Firewall just to things that where related to Minecraft. I can remember what it was, But try that out and get back to me.