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Unblock webserver IP

Discussion in 'Security' started by mauinet, Feb 15, 2015.

  1. mauinet

    mauinet Active Member

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    One of our servers IP is blocked from another of our servers. It is not blocked in iptables or in the routing table. We usc configserver's csf to manage the firewall. It appears that the IP was blocked by csf. It also does not appear in lfd.log. cpHulk is disabled. Neither server can ping the other.

    What else could be blocking the IP? BTW, I have checked both servers for a block.

    Thanks,
    Tony R
     
  2. Eric

    Eric Administrator
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    Howdy,

    CSF's files in /etc/csf are plain text. You should be able to do a grep in that folder to find them.

    Also tcptraceroute is your very best friend in these sorts of situations. I hate tracking something down only to have someone else block it.

    Thanks!
     
  3. mauinet

    mauinet Active Member

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    Hello,

    Thanks for the reply. I have grepped for the IP in /etc/csf and /var/log and in just /etc, not found.

    If I traceroute to the IP, it just shows stars, not even one hop showing.

    TonyR

     
  4. Eric

    Eric Administrator
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    Howdy,

    That's strange, are they in the same network block? Thanks!
     
  5. mauinet

    mauinet Active Member

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    Not in the same block but in the same data center so not many hops away.

    TR

     
  6. keat63

    keat63 Well-Known Member

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    is CSF blocking anything in either of the same subnets ?
    Maybe a router in the data center for instance.

    I guess you could temporarily disable CSF on both servers ?
     
    #6 keat63, Feb 16, 2015
    Last edited: Feb 16, 2015
  7. 24x7server

    24x7server Well-Known Member

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    Hello,

    Yes, May be there is network issues between your servers, You will have to discuss this with your server provider. Also I will suggest you take traceroute report from your both server and forward that your DC so that they will check this for you.
     
  8. mauinet

    mauinet Active Member

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    I think it may have been an external issue in the network. This morning, there was no longer a block. It would be nice to know what happened though.

    Thanks for the suggestions,
    TonyR

     
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