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DNS issues

Discussion in 'Bind / DNS / Nameserver Issues' started by Alejandro P, Dec 14, 2007.

  1. Alejandro P

    Alejandro P Well-Known Member

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    Hello, I have been fighting with this strange problem from some days ago

    Ocassionally some users have problems to connect the their websites, they can connect to the server via browser and can ping it and tracert fine. But they can't connect or ping their websites from their end.

    From our end and the rest of users everything works fine.

    Once I get a complain of this type I try whatever I can do

    Check to see if their IP is not blacklisted
    Restart named service
    Restart apache service
    But most of the time this doesn't work at all.

    Exactly as the problem comes it goes, nothing I did seems to have any effect on the solution. It goes and ocassionally reappears.

    Would you suggest me what would I do to find where the problem is and try to solve it.

    Thanks.
     
  2. rhenderson

    rhenderson Well-Known Member

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    What firewall are you running? If it is CSF it could be a temp ban, you need to look in there.

    Are you running mod_evasive? If so check and see if the IP is in the /tmp/ folder I think it is something like DOS_IP#, another temp ban

    It soulds like temporary blocks to me. If they have static IP's whitelist them and see if the problem goes away.
     
  3. Alejandro P

    Alejandro P Well-Known Member

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    rhenderson, I am running apf, I have disabled it also with no results.

    mod_evasive is not installed.
     
  4. rhenderson

    rhenderson Well-Known Member

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    Next time they encounter the issue, have them go to http://youhide.com and see if they can access the site. If they can, then the IP is most likely blocked, if they cannot then they may be having ISP issues.
     
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