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How to verify SSL certificates with OpenSSL on Command Line

To make sure that you have installed the SSL certificate correctly, we have have compiled a cheatsheet with OpenSSL commands to verify that multiple protocols use the correct certificte.

Test FTP certificate

openssl s_client -connect server.yourwebhoster.eu:21 -starttls ftp

Test POP3 certificate

openssl s_client -connect server.yourwebhoster.eu:995

Test IMAP certificate

openssl s_client -connect server.yourwebhoster.eu:993

Test SMTP SSL certificate

openssl s_client -connect server.yourwebhoster.eu:465

Test SMTP TLS certificate

openssl s_client -connect server.yourwebhoster.eu:587 -starttls smtp

Test HTTPS certificate

openssl s_client -connect server.yourwebhoster.eu:443

Test DirectAdmin certificate

openssl s_client -connect server.yourwebhoster.eu:2222
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  1. Daniel

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