Unable to connect to server after upgrading (from 3.0.11.2 to 3.0.12.x) Arch x86

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I'm running a server on arch linux (32 bit; don't ask) and it has been working very well with version 3.0.11.2, but since it's getting a little dated I decided it was time for an update. So I tried downloading version 3.0.12.4, and the server starts and acts normal, but the clients can't connect to... Unable to connect to server after upgrading (from 3.0.11.2 to 3.0.12.x) Arch x86