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Pingdom inaccurate results needs whitelisting - firewall rule update error

Discussion in 'Security' started by actived, Jun 17, 2012.

  1. actived

    actived Well-Known Member

    Mar 30, 2012
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    we use pingdom's free version to monitor whether our site is up/down.
    It sometimes gives a series of 'server down' email alerts when the website can actually be reached quite normally.
    It would be easy to write it off as a buggy service that gives wrong or inaccurate results, except for the fact that a lot of pingdom users seem to be very happy and sure that pingdom alerts are fairly accurate.

    It seems that it is mostly a firewall issue - where if you have blocked an IP range due to some malicious activity from that region, and pingdom happens to have a server in that IP range, it reports a down alert as the ping is blocked.

    These are the relevant links I found:
    Simple tool to list Pingdom Probe IPs
    Automatically update iptables rules for Pingdom monitors. | Personal blog of Chris Ergatides
    Automatically update Pingdom firewall rules | MG IT Solutions

    However when I tried out the last one - a script named, it gave a series of errors:
    We are using csf+lfd as well and every blacklist entry in cphulkd is also entered into csf+lfd blacklist manually.

    The alternative, as far as I understand would be to manually whitelist the IPs from the pingdom IP feed here:

    Any pointers on how to fix this?

    Any help is greatly appreciated.
    Thanks in advance,
  2. cPanelTristan

    cPanelTristan Quality Assurance Analyst
    Staff Member

    Oct 2, 2010
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    Re: Pingdom inaccurate results needs whitelisting - firewall rule update er

    There's an option for CSF to enable dynamic IPs based on a hostname. You might consider using that instead. It's DYNDNS in the CSF configuration file.

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