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Large Number of Failed Login Attempts from IP ... - auto blacklist?

Discussion in 'Security' started by MrVonn, May 9, 2012.

  1. MrVonn

    MrVonn Member

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    I am getting email often with "Large Number of Failed Login Attempts from IP ..." and options to block or white list. Can t automatically block it without me clicking link and logging in to website?


    Code:
    5 failed login attempts to account admin (system) -- Large number of attempts from this IP: 221.128.103.20
    
    Reverse DNS: tot-103-20.pacific.net.th
    
    Origin Country: Thailand (TH)
    
    Please use the following links to add to the black list:
    
    Single Ip: https://ip-111-222-333-444.ip.secureserver.net:2087/cgi/bl.cgi?ip=221.128.103.20
           /24: https://ip-111-222-333-444.ip.secureserver.net:2087/cgi/bl.cgi?ip=221.128.103.0/24
           /16: https://ip-111-222-333-444.ip.secureserver.net:2087/cgi/bl.cgi?ip=221.128.0.0/16
    
    
    
    Please use the following links to add to the white list:
    
    Single Ip: https://ip-111-222-333-444.ip.secureserver.net:2087/cgi/wl.cgi?ip=221.128.103.20
           /24: https://ip-111-222-333-444.ip.secureserver.net:2087/cgi/wl.cgi?ip=221.128.103.0/24
           /16: https://ip-111-222-333-444.ip.secureserver.net:2087/cgi/wl.cgi?ip=221.128.0.0/16
    P.S. what means /24 and /16?
     
  2. cPGoodJosh

    cPGoodJosh Member
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    Hello,

    Cphulkd won't automatically blacklist the IP addresses for you, however it will block them and sometimes that block can be extended by quite a bit. You would have to add them to the blacklist, either manually in WHM Main >> Security Center >> cPHulk Brute Force Protection or with the links you get in the email.

    As for what /24 and /16 are, those are what's called CIDR notation, which is a way to describe a block of IP addresses. You can find more information about it here:
    CIDR notation - Wikipedia, the free encyclopedia
    Classless Inter-Domain Routing - Wikipedia, the free encyclopedia
     
  3. MrVonn

    MrVonn Member

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    Can i just block them all to only have access from whitelisted ip's?

    allow 123.444.555.66
    block *.*.*.*
     
  4. psydoc

    psydoc Member

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    I'd be interested in seeing an answer to MrVonn's question. Is that possible?
     
  5. pwhjenny

    pwhjenny Well-Known Member

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    You can install firewall like csf that allows you to block certain IP range while whitelist certain Ip range. The lfd daemon also blocks Ip's that have several failed login attempt.
     
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