“Internal Server Error” when you try accessing your website. Further investigating you check the error logs (/usr/local/apache/logs/error_log) & see the error below.
[error] [client xx.xx.xx.xx] Caused by SystemException in API_Linux.cpp:444: execve() for program “/usr/bin/php” failed: Permission denied
If you read the error logs carefully, you see that the permissions on PHP binary are incorrect. Login to your server via SSH and correct them with command below.
# chmod 755 /usr/bin/php
Now, try accessing the website now. It should be functional & error log won’t report any such error messages.