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autodiscover redirect loop

Discussion in 'E-mail Discussions' started by edigest, Oct 21, 2015.

  1. edigest

    edigest Active Member

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    Just started last night -- no system changes. CloudLinux with LiteSpeed.

    Seeing the following errors in the Apache access log:

    /usr/local/apache/logs/access_log
    208.74.124.133 "GET /cgi-sys/autodiscover.cgi?email=<snipped..com HTTP/1.1" 503 1159

    Was working with autodiscover returning a 400 code up until a few hours ago.

    Corresponding error log:

    /usr/local/apache/logs/error_log
    [ERROR] [208.74.124.133:44947:proxy] detect loop redirection: /503.shtml

    This is happening from three CPanel IPs, 208.74.124.131, 208.74.124.133, 208.74.125.50.

    Everything else with the domain in question seems to be working correctly. Shared server with no autodiscover errors on other domains.
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello :)

    Could you verify the version of cPanel installed on this system so we can confirm if any existing cases apply to your particular issue?

    Thank you.
     
  3. edigest

    edigest Active Member

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    Meant to leave an update that this has been resolved. (After a few days it the post was buried without any attention so I never got around to it.)

    I was able to determine from CPanel support that the autodiscover request was a curl request (not apparent from the error message) and curl was blocked at the time of the errors due to an unrelated attack on the server.

    After unblocking curl, autodiscover began working again.
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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