Minecraft Server AUTH not functioning, can connect only in "cracked mode"

I am using an official Minecraft server, I validated it and everything, my friends and I recently had a pretty good time on it for about 7~ish hours. However, my final friend who did have a cracked account just got a real one, and they can join every other public server, but my server is the one continuing to throw "failed to login: the authentication servers are down for maintenance". Another thing to note that I saw: When online mode is set to false, it DOES have something in the ID field for whoever is connecting, but when turned on it always returns a "<null>" and fails to connect. Please ask me for any necessary additional info, I will try to reply as fast as I can.
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