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Hello,
Please add to this documentation page that another common cause of the 500 Internal Server Error is from the random_compat library. The solution here is to install libsodium.
I encountered this issue on CentOS 7 with apache v2.4.6 and php v5.6.33.
The random_compat library included with phplist requires some source of entropy. For users like myself which use open_basedir in /etc/php.ini to limit which directories in which php is allowed to execute, php is not permitted to access /dev/urandom. The solution recommended by the developers of random_compat is to add /dev/urandom to open_basedir, but I felt that was probably a bad idea.
Instead, I decided to install libsodium and the pecl libsodium extension for php. Indeed, this is the preferred source of entropy for random_compat.
After I installed the libsodium package and the pecl libsodium extension (and restarted my apache webserver), the 500 errors went away, and I was able to proceed with the phplist installation in my web browser.
For more information about this issue and its fix, please see my write-up on it:
Thank you,
Michael Altfield
Senior System Administrator
PGP Fingerprint: 8A4B 0AF8 162F 3B6A 79B7 70D2 AA3E DF71 60E2 D97B
Open Source Ecology
www.opensourceecology.org
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