I find in Apache's error log the following pattern appears frequently (almost once or twice per hour).
[Tue Sep 06 08:40:02.794875 2016] [mpm_winnt:notice] [pid 1956:tid 440] AH00428: Parent: child process 8412 exited with status 255 -- Restarting.
[Tue Sep 06 08:40:02.888476 2016] [mpm_winnt:notice] [pid 1956:tid 440] AH00455: Apache/2.4.23 (Win64) PHP/7.0.8 configured -- resuming normal operations
[Tue Sep 06 08:40:02.888476 2016] [mpm_winnt:notice] [pid 1956:tid 440] AH00456: Apache Lounge VC14 Server built: Jul 1 2016 11:43:51
[Tue Sep 06 08:40:02.888476 2016] [core:notice] [pid 1956:tid 440] AH00094: Command line: 'c:\\AppServ\\Apache2.4\\bin\\httpd.exe -d C:/AppServ/Apache2.4'
[Tue Sep 06 08:40:02.888476 2016] [mpm_winnt:notice] [pid 1956:tid 440] AH00418: Parent: Created child process 512
[Tue Sep 06 08:40:03.184879 2016] [mpm_winnt:notice] [pid 512:tid 336] AH00354: Child: Starting 128 worker threads.
It looks like AH00428 occurs, then Apache restarts itself. I researched online but still find no cure.
As can be seen above the web service is under Apache/2.4.23 (Win64) PHP/7.0.8 running on Windows Server 2012. I have researched the problem online for a long time and still can not find a cure. Could you please be so kind to help me?
Based on the information in the following statement:
[Tue Sep 06 08:40:02.794875 2016] [mpm_winnt:notice] [pid 1956:tid 440] AH00428: Parent: child process 8412 exited with status 255 -- Restarting.
Your process is returning a status code 255, which is actually:
ENOBUFS- No buffer space available
Either increase your buffer space (memory allotted to the process), or increase the LogLevel value to error in the httpd config file.