Block incoming Telnet connections

yatinthakur

• April 22, 2014 05:37

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

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  vanessa

  • April 22, 2014 14:13

  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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  cPanelMichael

  • April 22, 2014 18:09

  [quote="yatinthakur, post: 1626931">Is there any way to enable authentication for smtp ? I am using cpanel 11.5 with exim
  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: cat /usr/local/cpanel/version
  Thank you.

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  yatinthakur

  • April 23, 2014 09:03

  [quote="cPanelMichael, post: 1627482"> cat /usr/local/cpanel/version
  Thank you.
  root@server [/home/xxxx]# cat /usr/local/cpanel/version 11.42.1.11

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  cPanelMichael

  • April 23, 2014 13:01

  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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