php Sessions write error suddenly on website

http://kb.parallels.com/en/115704

Step 1

 cd /var/lib/php/
[root@austin php]# ls -la
total 12
drwxr-xr-x  3 root root 4096 Apr  9 19:54 .
drwxr-xr-x 37 root root 4096 Apr 24 23:41 ..
drwx-wx-wt  2 apache apache 4096 Aug  5 20:01 session

Change the permissions and ownership

chmod 1733 /var/lib/php/session
chown root:root /var/lib/php/session

Step 2

Check the yum update log for php updates as this is usually the cause of the permissions change.

[root@austin log]# grep php /var/log/yum.log
Apr 09 19:54:09 Installed: php-5.3.3-27.el6_5.x86_64

This will give you the date and time of the last php update!