Hey! Sorry if I missed something, but I couldn't find a matching result using the search function. First, my server infos: Dual Core 2gHz 3gb of ram. 16k DSL connection (Actually a little more. 17542 kBit/s down- and 1147 kBit/s upstream.) Windows Server 2003 x86 NO hamachi. Bukkit (latest version) A few plugins (Cant be the problem. Tried without Plugins already) So my problem is: External connections get a huge delay, or lag at all. Its noticable when trying to chat, break blocks or opening doors. Right after logging in there is no lag for the first few seconds. If they stay still and wait some minutes they can chat and break some blocks without a delay but after a short period of time the lag returns, especially when moving. And it's already lagging with one external connection / 1 Player (+ me from a internal connection). The server's RAM usage seems to be fine. CPU usage, too. What I already tried but giving no result: - Running the server without plugins - adding port forward (25565 UDP, already had TCP cause else no1 could connect) - turned off firewall + mcafee antivir There was no lag when the server was running on my notebook (2,4GHz QuadCore, Win7 x64 + x64 Java version, 4GB of RAM). And we were using hamachi (thats why I came up with the port forwarding since I forwarded the hamachi ports. I guess the ports were switched to the hamachi ports since the IP-packages were send through hamachi then. And since I had hamachi's ports forwarded I think it could be something related to that. Btw there was no lag with 4 external connections / players + me) Everything I did since then was: - Swapping to my server machine (and edited the port forwards to match the servers IP) - Installed XAMPP (Apache and MySQL running for a Website and some plugins) - added a few plugins and setting some up for MySQL (but I can ignore that cuz I already tried removing all plugins) Im not sure, since im logging in from my local network, but I think when I switchted to the server machine there was no lag. At least no1 told me there was. Any suggestions? Is there a tool to watch used ports?