CompTIA CASP+ Practice Test

When evaluating the potential reasons for a newly added PHP application not functioning properly, the most likely issue could be related to the configuration of the server's security settings, particularly regarding SELinux (Security-Enhanced Linux). If SELinux is in enforcing mode, it can impose strict rules on how processes interact with files, including web applications.

If HTTP access to home directories is restricted by SELinux, the newly uploaded PHP application may not have the necessary permissions to execute or access the resources (like files and directories) it requires to run. This can result in errors when the application is accessed through a web browser, leading to perceived non-functionality.

In contrast, while the Apache configuration file might be a concern, it is less likely to be the single point of failure if the server itself is serving other applications without issue. Similarly, if the application was not uploaded correctly, this would typically be apparent through file access errors or missing components, which are often traceable. Lastly, insufficient server memory could lead to performance issues but is less likely to be the sole reason for a complete failure of application execution right after deployment.

The influence of SELinux enforcing rules could directly prevent the application from functioning as intended, making it a key consideration when troubleshooting newly deployed PHP