I've created a Minecraft server using CraftBukkit on a Minecraft version 1.7.9. The server is hosted on a VPS. When the server is created in online-mode=true I can't join the server and it outputs with an error message "Authentication servers are down. Please try again later, sorry!" When the server is created in online-mode=false I can join the server, but I can't see any player's skin (All players are steves - default skin), just mine only. I've been googling, searching online for any solutions, just to find myself hopeless. As to what I came across while searching, that there seems to the need to 'allow' certain IP's with ports to the network traffic for the authentications to work. Source: http://www.minecraftforum.net/forum...ommon-1-7-issues-and-ways-of-fixing?comment=3 Searched for how to do something like this and found that I have to do something with iptables. I don't know much about them, but tried to add the 443 port to INPUT section of the iptables, but that didn't help. I also tried to put it in OUTPUT section and still not working. Also tried to find how to add IPs, but had no luck. If there is a way on how to fix this, please let me know and if you need any more information i'll be glad to give you!