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I need to provide a screenshot to show what kind of ciphers are supported on my openSSL server. Is there a command for this? or is this something i need to find elsewhere?

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Is there a command for this?

openssl ciphers 'ALL'

will list all the encrypting ciphers.

openssl ciphers 'ALL:COMPLEMENTOFALL'

will list all ciphers.

If you want to confirm the list, you could use a script to cycle through each cipher and try to connect a tls-client with that cipher. You might also want to cycle over version as well, this is illustrated in this example bash script

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