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?
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.
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
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protected by Community♦ Jan 25 '13 at 9:35
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