most of the remote software uses port number to login and a software tool for update of your IP to where you are located.
i found out a simple way to sniff this and trace for open ports in your computer.
a hacker tool used for sniffing ports can be useful too for your security.
download
this tool will help you trace what port is open for a remote desktop access without your permission, after you can block that port if you dont know that port.
RealVNC uses port 5800-5900 for remote access dont know the others.
after you download the namp tool install this in your computer, after installed you can run the GUI or you can use CMD or command prompt for the nmap tool to work.
in your CMD type nmap(space)--traceroute(space)"yourIP" then wait for awhile
you able to see a text consisting a port number and name of the application who uses that port
Code:
Starting Nmap 5.21 ( http://nmap.org ) at 2010-05-21 09:09 China Standard Time
Nmap scan report for 192.168.1.106
Host is up (0.0034s latency).
Not shown: 991 closed ports
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
111/tcp open rpcbind
443/tcp open https
1720/tcp open H.323/Q.931
2000/tcp open cisco-sccp
3306/tcp open mysql
4445/tcp open unknown
8000/tcp open http-alt
MAC Address: 08:00:27:98:30:B1 (Cadmus Computer Systems)
HOP RTT ADDRESS
1 3.42 ms 192.168.1.106
to know your ip, in your CMD type "ipconfig"
Code:
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
IPv4 Address. . . . . . . . . . . : 192.168.1.106
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
hope this will help a little.