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Bug#750739: apache2-mpm-worker: Can't start with >= 5000 VirtualHosts with 'SSLEngine On' - "AH00016: Configuration Failed". sysctl fs.file-max=512000

On Monday 16 June 2014 14:20:27, INTEN - Damian S. Kołodziejczyk 
> error log shows only "AH00016: Configuration Failed"

If you have separate error logs for ssl virtualhosts, please also 
check those for additional error messages.

> i increased max openfiles (sysctl fs.file-max=512000) becouse
> i also increased FD_SETSIZE in httpd.

Did you do this to try to fix this issue or was this an unrelated 
change to fix something else? httpd should not use FD_SETSIZE 
internally (though some library used by httpd may).

> Normal virtualhosts = 40 000 and working,
> SSL virtualhosts < 5000 and "AH00016: Configuration Failed"

You could try to start it under "strace -f" and try to see if there is 
some system call that fails shortly before this message is printed.

BTW, you original report said "version 2.2.22-13+deb7u1", but the 
AH00016 tag was only introduced in 2.4. Which version do you use 

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