you couldn't connect to the server because of a crash, bad connection, etc. Wait about an hour than try again.
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Type in the IP address or Hamachi address of your friend's correctly or play the premium Minecraft. Myncraft1: Your friends has to be on (Hamachi) to connect to his server
if you created it right then they have to know you multiplayer server address to get to your multiplayer server
Type "What is my IP" On google and copy/paste it in your direct connect box if you have your router port forwarded and a server program running on your PC
There could be a number of reasons. (A) he/she might be using the browser to try to connect. (B) if it's a public server they might be "whitelisted". (C) not sure bout this one but they may have a mod unsupported by the server. Hope this helps!
either you don't have An internet connection or you have a cracked account on minecraft and it wont let you on. The alternative to this is their minecraft server was having issues.