http://dev.bukkit.org/server-mods/betterannounce/
Be aware that Towny isn't the best performance wise. I am lead to believe that this is why the majority of the large servers use factions.
Is this the latest version of mob arena? Try saving your old config, deleting it from the server files, and then rebooting.
Check that your selected port is opened correctly with a website like canyouseeme. Make sure you've used the correct internal IP, and disable...
What permissions plugin are you using? PEX: -modifyworld.chat bPermissions: ^modifyworld.chat PermissionsBukkit: modifyworld.chat: false
Ensure your windows firewall is properly configured to ignore your server.
Lockette just released an update; http://dev.bukkit.org/server-mods/lockette/
This. You've probably updated your server and not your plugins.
Run a read/write speed test, they vary depending on what OS you use. SSDs are faster, but are known to be unstable and less reliable. HDDs...
It's yet another DNS provider, no different to the rest. Prehaps your issue isn't with the hostname?
Separate names with a comma.