Solsaere

Like I said, I had the same problem. The server launched perfectly (or appeared to, anyway), and I could connect from the desktop computer that it was running on, but no other computer could connect. The vanilla bukkit server still worked and 25565 was open. People could connect to Tekkit when I ran the same server files on my laptop, but not my desktop. When I launched the server with a different .bat, however, the server became visible and people could connect to my desktop. Same exact problem word for word.

I had the same problem as you and since I found it so hard to find the solution I thought i'd better post it here. (To all those people who posted asking for a solution to a problem and then simply said "nevermind, I fixed it", ending the thread with no help at all; I hate you.) I found out that the .BAT launch file is either formatted wrong or it just doesn't work on some computers. Just edit Launch.bat to say this if you have java7: @ECHO OFF SET BINDIR=%~dp0 CD /D "%BINDIR%" "%ProgramFiles%\Java\jre7\bin\java.exe" -Xmx1024M -Xms1024M -jar tekkit.jar PAUSE I just changed the command for launching craftbukkit (Found here:http://wiki.bukkit.org/Setting_up_a_server) to say tekkit.jar rather than craftbukkit.jar