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How can I tell if my server is available online to everyone in the world? Port checkers say port 25565 is unblocked in my IP. Does this mean it is OK? I have also successfully port forwarded. Is this OK?

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when you say port checker, do you mean an online port checker? –  z - Dec 14 '11 at 1:34
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If you want to answer your own question (perfectly valid), fill out an answer in the space below (where it says "Your Answer") and post. –  Nick T Dec 14 '11 at 1:43
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Honestly probably the simplest way to check is to ask someone to log in. –  John the Green Dec 14 '11 at 4:15
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2 Answers

You may try the port checkers you mentioned. But you can't really be sure unless you actually have someone connect to the server.

I once had a problem with this; it was on a local network, the computers saw each other, but still it didn't work. We always got an error message and were disconnected. Interestingly enough, when we tried switching the computers, the connection worked normally. (We never resolved this issue.)

In general, there are quite a few things that could go wrong. In case you have problems with connectivity, check the game configuration, your firewall settings and in case you are behind a router, check its configuration. You will have to at least set port forwarding up.

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You can easily test if your server is publicly accessible by typing your server's public IP address into Minecraft.

You can find out your IP address by browsing to http://www.whatismyip.com or searching for IP into Google, and then add your port onto the end like this: xxx.xxx.xxx.xxx:port

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I do this for my webservers and this always works –  Serge Bekenkamp Sep 23 '12 at 23:01
    
This is a way to figure out your server IP, but not to test whether it is accessible from Internet –  lispmachine Nov 2 '12 at 11:19
    
@lispmachine Actually it is. Type the IP into Minecraft. –  ryansworld10 Nov 2 '12 at 15:07
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@ryansworld10 If connection can be made from within the LAN that does not mean the server is accessible from outside (some firewall may block connection / NAT in use). In fact in case of NAT you may even not be able to connect to server public IP from LAN, but it doesn't mean it's down. –  lispmachine Jan 14 '13 at 9:48
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@ChaseFleming I beg to disagree. Firstly port forwarding on your router may or may not forward connections from LAN to external IP and redirect them back to server in LAN. As a mater of fact I tested it with my router and it does not forward connections in such a way. Secondly, although this is uncommon, a firewall may be blocking incoming connections from the Internet. –  lispmachine Feb 22 '13 at 8:58
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