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Block incoming Telnet connections

Discussion in 'General Discussion' started by yatinthakur, Apr 22, 2014.

  1. yatinthakur

    yatinthakur Member

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    Hello

    I wonder how can I block incoming connections via telnet. ? so that user can not send emails using telnet server ip 25/

    Or

    Is there any way to enable authentication for smtp ? I am using cpanel 11.5 with exim


    Thanks
    Yatin
     
    #1 yatinthakur, Apr 22, 2014
  2. vanessa

    vanessa Well-Known Member PartnerNOC

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    You can't really block telnet specifically - all that does is allow a connection to open to a remote server. When someone uses telnet to connect to port 25, the server doesn't see that as being any different than a mail client opening an SMTP connection.

    What I suspect you're actually asking is how to prevent email from being relayed through your server. By default, cPanel configures your server to require SMTP authentication. Is there any reason you believe that your server is not set up this way?
     
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    #2 vanessa, Apr 22, 2014
  3. cPanelMichael

    cPanelMichael Technical Support Community Manager Staff Member

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    That is not a valid version of cPanel. The latest cPanel/WHM builds are version 11.42. You can verify your version of cPanel via the following command:

    Code:
    cat /usr/local/cpanel/version
    Thank you.
     
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    #3 cPanelMichael, Apr 22, 2014
  4. yatinthakur

    yatinthakur Member

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    root@server [/home/xxxx]# cat /usr/local/cpanel/version
    11.42.1.11
     
    #4 yatinthakur, Apr 23, 2014
  5. cPanelMichael

    cPanelMichael Technical Support Community Manager Staff Member

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    Check to make sure that "Antirelayd" is unchecked in "WHM Home » Service Configuration » Service Manager". SMTP authentication is required as long as this service remains disabled.

    Thank you.
     
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    #5 cPanelMichael, Apr 23, 2014
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