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I ran rkhunter -c on a server an the warning that i got was the following:

Checking if SSH protocol v1 is allowed       [ Warning ]

Warning: The SSH configuration option 'Protocol' has not been set.
The default value may be '2,1', to allow the use of protocol version 1.

So i ran the command: 

nano sshd_config

I added the line 

Protocol 2

then re-ran the rkhunter command but received the same warning. What else can i try?

Thank you.

muru
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Jacques Walker
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    Die you restart the SSH server after the config change ? – Robert Riedl Jan 19 '18 at 14:00
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    Strange that this question was closed because it was too broad... Well, if you have `Protocol 2` in your `/etc/ssh/sshd_config` file, then open `/etc/rkhunter.conf` and change `ALLOW_SSH_PROT_V1=2` to `ALLOW_SSH_PROT_V1=0` and rerun `rkhunter`. From the config file, I cite: _If the 'Protocol' option has not been set in the SSH configuration file, then a value of '2' may be set here in order to suppress a warning message. A value of '0' indicates that the use of SSH-1 is not allowed._ – lucasart Aug 22 '19 at 04:26
  • I agree that question may stay open. Explicitly you can try to SSH using protocol 1 or 2 with: ```$ ssh -1 your_server SSH protocol v.1 is no longer supported ``` If you do `ssh -2 your_server`, this shall be only accepted – frank_108 Oct 29 '20 at 19:02

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