Apache Full of Reading Request | 0 idle workers

Jan 9, 2018
18
2
3
.
cPanel Access Level
Root Administrator
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.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,909
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It turned out to be Modsecurity issue, no downtime after temporarily disabling it
Hello,

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

Thank you.
 
Jan 9, 2018
18
2
3
.
cPanel Access Level
Root Administrator
Hello,

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

Thank you.
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.