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I'm s server-side developer and used to invoke the nc
command to check whether a remote port is open.
Suddenly, the security guy prohibited the command and as soon as I use the nc
command my accessibility to the EC instance get lost.
They're saying
Use
telnet
.
My questions are
- Is the
nc
command dangerous? - Has any security hole?
- Has any functionality can be used in any dangerous way?
I'm fairly certain telnet sends credentials in plain text. So if this is all on a local segmented network and no possibility of your traffic being sniffed you should be fine. If you working outside of a local network, ssh is a safer substitution for accessing remote machines. – user136952 – 2019-07-17T02:38:11.083