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Quick Tip – telnet with ssl

I’ve often used telnet to connect to random ports to make sure a service is working (eg: telnet somehost.example.com smtp to see if it’s accepting connections on port 25) but have been stuck with a suitable alternative to test connections that are secured with ssl.

Of course openssl is capable of doing this. Simply type:

openssl s_client -connect somehost.example.com:465

This will test an ssl secured connection to the secure smtp (smtps) port on a mail server. Change port number as required.

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