Symptoms

When PHP pages are accessed, browser shows 500 error and following is thrown in webspace logs and httpd error_log:

Premature end of script headers: php

Cause

One of the causes is that the /etc/nsswitch.conf file was modified to exclude ng database. Thus, a php-cgi script is not being executed - the server cannot locate the web user to run the script.

Resolution

Ensure that the file /etc/nsswitch.conf contains lines:

~# egrep '^passwd|^shado' /etc/nsswitch.conf
passwd:     files ng 
shadow:     files ng

And restart httpd:

~# service httpd restart

Please see KB #114406 for additional details.

NOTE: it might also be necessary to restart redis and httpd services for the changes in nsswitch.conf to take place:

  1. On NG webservers do:

    ~# service httpd stop
~# service redis stop

  2. On POA Management Node do:

    ~# chkconfig --list | grep redis

    To locate the exact redis service that is used with NG. E.g., redis.75. Issue:

    ~# service redis.75 restart

  3. On NG webservers do:

    ~# service redis start
~# service httpd start

Verify that nscd service is not running, see KB #/121938 for details

Internal content