Can you post a couple log entries from you telnet log?  I think I can help create a filter file for you and a jail file for you.

On 12/5/2022 11:33 AM, solarflow99 wrote:
hi, What i'm trying to do is have the telnet server jailed the same like sshd is.  I see support for httpd, bind, etc. lots of other services but nothing I can find for telnet.  Its not common anyone would use telnet anymore, maybe thats why but I have a use case where I do need it.


On Mon, Dec 5, 2022 at 11:19 AM Nick Howitt via Fail2ban-users <fail2ban-users@lists.sourceforge.net> wrote:

    Top posting as the thread is a mess.

    Is this really correct? You can telnet into lots of open ports e.g
    80 and 25. Even SSL ports like 443 and 587, not that you can do
    much once you're in.

    On 05/12/2022 18:32, solarflow99 wrote:
    thats right, who needs that anyway.  I'm so glad to get your
    answer, I don't know what i'd do without it.

    Great help, thx!



    On Mon, Dec 5, 2022 at 10:13 AM Patrick Shanahan
    <p...@opensuse.org> wrote:

        * solarflow99 <solarflo...@gmail.com> [12-05-22 12:26]:
        > great answer!
        >
        >
        > On Mon, Dec 5, 2022 at 6:20 AM Patrick Shanahan
        <p...@opensuse.org> wrote:
        >
        > > * solarflow99 <solarflo...@gmail.com> [12-05-22 00:29]:
        > > > Is there any way to do this?
        > >
        > > block port 23 tcp
        > >
        > >
        > >
        > > > _______________________________________________
        > > > Fail2ban-users mailing list
        > > > Fail2ban-users@lists.sourceforge.net
        > > > https://lists.sourceforge.net/lists/listinfo/fail2ban-users
        > >
        > >
        > > --
        > > (paka)Patrick Shanahan       Plainfield, Indiana, USA   
              @ptilopteri
        > > http://en.opensuse.org   openSUSE Community Member   
        facebook/ptilopteri
        > > Photos: http://wahoo.no-ip.org/piwigo                
         paka @ IRCnet oftc
        > >

        it is the *correct* answer

-- (paka)Patrick Shanahan       Plainfield, Indiana, USA        
        @ptilopteri
        http://en.opensuse.org   openSUSE Community Member   
        facebook/ptilopteri
        Photos: http://wahoo.no-ip.org/piwigo                  paka @
        IRCnet oftc


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