My issue is very similar to this, except I have the predicament of running it on an Ubuntu server. On Ubuntu server, there is .bat files. [xxx WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE! [xxx WARN]: The server will make no attempt to authenticate usernames. Beware. [xxx WARN]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose. [xxx WARN]: To change this, set "online-mode" to "true" in the server.properties file.is what is sent along with it loading. These are the files/directories in the directory it is all currently in. I colored directories a dark blue, jar files a red, and files are just black text. banned-ips.json craftbukkit-1.8.5.jar Kaig Realms_nether ops.json server.properties world_nether banned-players.json eula.txt Kaig Realms_the_end permissions.yml usercache.json world_the_end bukkit.yml help.yml lib plugins whitelist.json commands.yml Kaig Realms logs server.log world In the server.properties file I have online-mode=true, so it is set to true already. The server log is empty. Hopefully one of you have encountered this before, and if I solve it before there is a solution proposed here, I will post it.