In some environments, a timing problem prevents the NDP user space application (ndpapp) from loading, and in turn, NSS cannot be loaded until the problem resolves itself. You can increase the UDEV event handling limits to 1024 to circumvent this problem. For instructions, see NSS Takes Up to 10 Minutes to Load When the Server Is Rebooted
in the OES 2 SP3: NSS File System Administration Guide for Linux.