On Linux, it is easy to know what ports are open. You just need to use the program "nmap". If you don't have it on your system, download and install it using the command:
#apt-get install nmap
on your Ubuntu or using the yum for Fedora/RedHat/CentOS as follows:
#yum install nmap
Once installed, issue the command:
#nmap localhost
to know which ports are open in your computer.
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