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No matter what I do to my EC2 instance, any size and with apache/ubuntu.

I can't get it to go over 1400 concurrent connections.

Have set the prefork settings high, set ulimit to 1000000

Is this something to do with AWS?

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Is it possible that the kernel is limiting the number of connections? What do you need more than 1400 connections for anyway? –  Robbie Mckennie Feb 22 at 5:11
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What happens when you try to get more connections? –  David Schwartz Feb 22 at 6:40
    
By default 1024 connection are aloowed in /etc/security/limits.conf , it can be increased upto 65535 connections max.. –  Abhishek Anand Amralkar Feb 22 at 9:07
    
Check apache error log /var/log/apache2/error.log for specific error (ex: MaxClients maxed out) –  LinuxDevOps Mar 21 at 14:02

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