can't communicate with ypbind

Cause

ypcat passwd returns with the error message, can't communicate with ypbind, but ypbind is running.

ls -l /var/yp/binding/ypbind.pid   
-r--------   1 root     root           3 Dec  1 07:40 ypbind.pid  

Action

Set umask for root back to 022. /var/yp/binding/ypbind.pid must be readable by all groups.

Refer to the following example:

ls -l /var/yp/binding/ypbind.pid   
-r--r--r--   1 root     root           3 Dec  1 07:40 ypbind.pid