Internal Server Error: CageFS jail error Unable to determine realpath of /home/USER (No such file or directory)

Symptoms

You will see errors like the following in the Apache error log (/var/log/apache2/error_log):

CageFS jail error Unable to determine realpath of /home/USER (No such file or directory)

Description 

This can be caused by CageFS not being properly mounted.

Workaround

CageFS can be remounted with the following command via SSH when logged in as root:

cagefsctl -M

Additional Resources

CloudLinux Knowledge Base | CloudLinux OS | CageFS | Unable to determine realpath of /home/XXX (No such file or directory)