"500 Internal server error" when trying to access Plesk and websites

Created:

2016-11-16 13:00:06 UTC

Modified:

2017-06-08 14:14:42 UTC

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"500 Internal server error" when trying to access Plesk and websites

Applicable to:

  • Plesk for Linux/Unix

Symptoms

The browser displays 500 Internal server error when trying to access the Plesk Web Interface or websites. Sometimes, only particular pages fail to work; for example, the "License Management" page ( Tools & Utilities -> License management ).

Note : For a solution to "500 - Internal Server Error", see article #114882:[HUB] 500 - Internal Server Error

Cause

Enabling the Linux kernel parameter kernel.yama.ptrace_scope prevents access to the license management page. This parameter is enabled on Ubuntu 10.10 or newer versions by default.

Resolution

Disable the kernel.yama.ptrace_scope Linux kernel parameter by running the below commands on your server:

# echo "kernel.yama.ptrace_scope = 0" >> /etc/sysctl.conf 
# sysctl -w kernel.yama.ptrace_scope=0
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