I have recently installed few packages for telnet, mysql and postgreSQL. I can access all these service locally on the ubuntu server but somehow I am not able to access these services from other machines.
Below are the active internet connections using:

sudo netstat -tulpn 



tcp   0    0 0.0.0.0:23     0.0.0.0:*    LISTEN      18776/inetd

tcp   0    0 0.0.0.0:3306   0.0.0.0:*    LISTEN      19451/mysqld

tcp   0    0 0.0.0.0:5432   0.0.0.0:*    LISTEN      8453/postgres

I am not able to figure out what I am missing. I am almost sure that I have configured these packages correctly to allow outside world connections.

When I am trying telnet from windows, I got "Could not open connection to the host, on port 23: Connect failed"

I doubt, my router might have blocked these connections but I don't know how to troubleshoot or unblock these connections. Please suggest, Many thanks!