is there any way to close a trojan port?

[wei_c]

such as an open port 5000?

[Wayne - DiamondCS]

Using a socket tool such as Port Explorer (http://www.diamondcs.com.au/portexplorer/) you can right-click on a port and choose to close it, but usually the best way to close a port is by stopping the program that uses that port (Port Explorer will easily show you which process it is). You can also use a personal firewall to restrict access to that port.

Best regards,
Wayne