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Thread: Protocol 2 no longer in sshd_config file

  1. #1
    Join Date
    Mar 2018
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    2

    Protocol 2 no longer in sshd_config file

    In Ubuntu 18.04 Server, in the /etc/ssh/sshd_config file, there is no longer a commented out line for Protocol 2.

    Does this mean that Ubuntu 18.04 no longer supports legacy versions of the SSH protocol and this entry is deprecated?

    I saw nothing about this in the Release Notes: https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes

    It would be great if any changes to configuration files were listed there.

    Kind regards,

    Ted

  2. #2
    Join Date
    Feb 2011
    Location
    Coquitlam, B.C. Canada
    Beans
    2,576
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Protocol 2 no longer in sshd_config file

    Quote Originally Posted by tleroy1 View Post
    In Ubuntu 18.04 Server, in the /etc/ssh/sshd_config file, there is no longer a commented out line for Protocol 2.

    Does this mean that Ubuntu 18.04 no longer supports legacy versions of the SSH protocol and this entry is deprecated?
    I think what has happened is that protocol 1 has been deleted, and thus there is no longer an option for protocol because there is only the one (meaning protocol 2) now.

    Reference:
    https://www.openssh.com/txt/release-7.6 see "Potentially-incompatible changes" (copied below):

    Code:
    This release includes a number of changes that may affect existing
    configurations:
    
     * ssh(1): delete SSH protocol version 1 support, associated
       configuration options and documentation.
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  3. #3
    Join Date
    Mar 2018
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    2

    Re: Protocol 2 no longer in sshd_config file

    Quote Originally Posted by Doug S View Post
    I think what has happened is that protocol 1 has been deleted, and thus there is no longer an option for protocol because there is only the one (meaning protocol 2) now.

    Reference:
    https://www.openssh.com/txt/release-7.6 see "Potentially-incompatible changes" (copied below):

    Code:
    This release includes a number of changes that may affect existing
    configurations:
    
     * ssh(1): delete SSH protocol version 1 support, associated
       configuration options and documentation.
    Thanks Doug,

    I missed that in the release notes. That answers my question.

    Kind regards,

    Ted

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