Networking – blocking the ports


How do I find out what is blocking my ports? I am on Windows 7 x64 and trying to run Minecraft on port 25565, which worked yesterday, but not today. I have not installed any new software.

I have tried disabling Windows firewall, and I previously added two days ago a port forwarding setting to my modem. Since it worked yesterday I don't think it has to do with my ISP.

Best Answer

  • You can see what applications are using what ports by running the following in command prompt

    netstat -anobv

    Once you find out what program is holding the port, if it is not important you can kill the process from task manager.

    Something I have noticed is that minecraft will sometimes not shutdown all the way and the java program is running in the background. I have to kill the java process from task manager.

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