Hi drtshock I am contacting you becuase we are having problems with the UUID essential.
The Id of a different person gets cloned/copied, this person has a different username from the original. For example this person logs in with UUID player1, when he gets kicked he gets replicated with the nam player1 but with UUID player2. This is a big problem because most Italian servers have been griefed by people exploiting this bug. We have noticed this problem even with the lates version of TeamCity-md_5 relesed by you. It seems like this problem has always existed ma that it has only been recently descovered by a Ukranian. If you need more info I can send you the logs in private.
Thank you in advance

Are you running in online mode?

1. We don't support cracked servers.
2. Even if you are in offline-mode, please learn to read the manual and enable ip-forwarding.

No. Enable forwarding, and better yet, don't use a cracked server.

Instead, can you do that Essentials store playerdata with nicknames when the server is in offline mode or stop that essentials change the UUID at the players?

[14:07:04] [Server thread/INFO]: [Essentials] Found new UUID for (Playername). Replacing 273129a4-b4de-3bae-8d7b-0f7e01a1ad6e with cb****-ed-dc-_d_e-**ef*******cf

So the forwarding is enabled too, this happened whena a player was kicked for flying (or related)
and the most populated minecraft server are using offline mode.

1. I highly doubt that claim.
2. Offline mode (that doesn't have an online-mode proxy) is not supported. Either way, this isn't an Essentials issue. Patch your server software to retain names...

If you are behind BungeeCord, read the wiki very very closely.

1. My server is running in offline mode.
2. yes using Bungeecord, but I can bypass with a bungee locally, even with the doors closed.
   Unfortunately this problem is occurring throughout Italy, the third high-level Italian servers were a victim (including my server).
   if you want to send you the logs in private on spigotmc.