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to see if the port open from another system ? to check firewall or that a proc is listening on that port ?
you can telnet to the port number "tn hostname portnumber"
tn my_host.com 25
If you are on the box, you can check netstat -an and grep for the port number ...
if you have lsof installed, you can also check the port number is associated with a process via lsof -i: port_number
HTH
Mark Taylor
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