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Apache Full of Reading Request | 0 idle workers

Discussion in 'EasyApache' started by Chirag Aggarwal, Jan 19, 2018.

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  1. Chirag Aggarwal

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    Hello,

    Since few days, there have been multiple downtimes due to no idle worker left for Apache

    Current Max Workers are 150 which worked fine before

    Code:
    150 requests currently being processed, 0 idle workers
    
     RRRRRRRRRRRRRRRRWKRRRRRRRRRRRRKRRKRKRKRRRRRRRRRRRRWRRRRRRKRRRRRR
     RRRRKRRRRRRRRRKRCRRRRRKRRRRKCWRRRRKRRKRCRRRRRWKRKRRRRKWRRRRRRRRR
     RRRRRRRWRRRKRRRRRRWRRR
    
    This seems to be Slow HTTP attack which no method has worked for me. I'd appreciate some suggestions regarding it.
     
  2. Chirag Aggarwal

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    It turned out to be Modsecurity issue, no downtime after temporarily disabling it
     
  3. Tearabite

    Tearabite Well-Known Member

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    Can you give a little more info on how you fixed this? We occasionally have this same issue and also use Mod_Security.
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    Would you mind sharing some more information about the particular issue with ModSecurity?

    Thank you.
     
  5. Chirag Aggarwal

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    Hello,

    There were multiple hits on Modsec on multiple websites which was higher than before. It could have been an attack but to experiment, disabling ModSecurity worked for me.

    My assumption includes that possibly misconfiguration was causing many requests to not get through neither return any response. But I am still not clear of it. I'm still monitoring it if there's anything else bugging.
     
  6. Tearabite

    Tearabite Well-Known Member

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    a DNSBL lookup rule in Mod_Security would cause this if the DNSBL is down/responding slowly.
     
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