> Source: [sk169656](https://support.checkpoint.com/results/sk/sk169656)

# sk169656 - Apache fails to start, and when user manually starts it, he sees a "no space left on device" error

| Property | Value |
|----------|-------|
| Solution ID | sk169656 |
| Date Created | 2020-09-25 |
| Last Modified | 2020-10-29 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | R81 (EOS) |
| OS | Gaia |
| Platform | Smart-1, VMWare ESX, Open Server |

## Symptoms

- * Apache fails to start, and when user manually starts it, he sees a "no space left on device" error in the `apache_error.log`:  
  \[Fri Sep 25 12:20:25.267265 2020\] \[core:emerg\] \[pid 26992\] (28)No space left on device: AH00023: Couldn't create the proxy mutex   
  \[Fri Sep 25 12:20:25.267285 2020\] \[proxy:crit\] \[pid 26992\] (28)No space left on device: AH02478: failed to create proxy mutex  
  AH00016: Configuration Failed
* When user runs `netstat -nap | grep 80`, port 80 is not listening.
* When user runs `netstat -nap | grep 443`, port 443 is not listening.
* When user looks over the `$UEPMDIR/logs/apache_access.log` and `$UEPMDIR/logs/apache_ssl_access.log`, he sees no new logging events after Apache goes down.

## Cause

The Apache semaphores (quota limit) has been reached and was not cleared.   

Semaphores are an apparatus for conveying information by means of visual signals. But, when it comes to programming, semaphores are used for communicating between the active processes of a certain application.  

In the case of Apache, they are used to communicate between the parent and child processes. If Apache cannot communicate properly with all of the processes that it starts, it stops running and fails to start.  

Refer to the following URL Links for more information:  

* [https://major.io/2007/08/24/apache-no-space-left-on-device-couldnt-create-accept-lock/#:\~:text=If%20your%20filesystem%20uses%20quotas,the%20culprit%20in%20these%20situations.](https://major.io/2007/08/24/apache-no-space-left-on-device-couldnt-create-accept-lock/#:~:text=If%20your%20filesystem%20uses%20quotas,the%20culprit%20in%20these%20situations.)
* <https://www.e2enetworks.com/help/knowledge-base/how-to-solve-apache-error-no-space-left-on-device-cannot-create-sslmutex/>

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