how to check if the port is opened or blocked?

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how to check if the port is opened or blocked using telnet client?
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Very good explanation so simple and informative

randhirraj
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I did this and the port still cant make connection

sychophantt
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Can someone please help me to open a port? TIA

sunishravindran
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i tried this to check if my computers 1604 port was open, its bocked, i guess im safe :P

kingbaakaD
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My pc 9999, 9903, 9905, 9009 port block how to unblock

santubhat
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Telnet doesnt tell you anything. My forward ports are open and the server worked properly yet all the port checkers including telnet command claims my ports are no accessible.

raymondchow