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How to disable SSH's protocol 1.
Posted by admin on 11 September 2009 11:11 PM
SSH has two protocols it may use, protocol 1 and protocol 2. The older protocol 1 is less secure and should be disabled unless you know that you specifically require it. Look for the following line in the /etc/ssh/sshd_config file, uncomment it and amend as shown:

# Protocol 2,1
Protocol 2

and restart the sshd service
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