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Do you know how to reject SSH user connecting with weak crypto lik DES?

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Use the Protocol and Ciphers options for sshd to restrict the algorithms the client is allowed to use.

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"Ciphers" has its own defaults. If clients don't meet my set ciphers, sshd reverts its defaults which are aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128, arcfour256,arcfour,aes192-cbc,aes256-cbc,aes128-ctr, aes192-ctr,aes256-ctr –  jack Jul 20 '10 at 9:43
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