It turns out I was using a simple glass texture pack and I didn't realize it. An admin can mark this as resolved. Sorry about that! :/
I don't believe so but I'll check.
Why is it then that after I receive that message no one can connect to my server unless they use localhost: on my wifi?
As far as I know it has always been that way. (At least since 1.0)
Keeton Feavel
It turns out I was using a simple glass texture pack and I didn't realize it. An admin can mark this as resolved. Sorry about that! :/