Unable to Contact Server System

When your system cannot contact a network system, an error message similar to this is displayed:

portmapper not responding: giving up

This problem occurs in one of these situations:

The system is not running.
Physically go to the system or call the system's Primary User or Administrator to check to see if the system is powered up and running.
The network is not running.
To check, try to access another system on the network.
The network administrator changed some information about the system or about the system's logical location on the network.
Check whether this is the case, and get the appropriate information to fix the problem.
The system has too many users or systems using its resources. It cannot provide services to you at this time.
Contact the system's Primary User or Administrator to check on this.