In my previous post on testing of open port in a server, we have learned that telnet command can be used in confirming if a port is open in a server. However, even though a port is already opens in a server, it will show as not open in this testing.
This may be due to firewall setting in blocking the access to all ports in that server. Or access list may be implemented in such a way that only permit a certain IP address ranges of devices to access to the server.
This is one of the effective way in securing server systems you manage. Rather than relying only on server security setting, we also should take care on the network security. Having more than one measure in place will ensure better security in your systems.
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