Can't connect to localhost:631

[Dwight Paige]

I can't connect to localhost:631 in either openSUSE 11.1 or Mandriva 2009.0 [both are AMD 64 and KDE 4] in either Firefox or Konqueror. I could a few days ago. In Konqueror I get this:

The requested operation could not be completed
Connection to Server Refused
Details of the Request:
URL: http://localhost:631
Protocol: http
Date and Time: Friday 20 February 2009 03:04 pm
Additional Information: localhost: Unknown error
Description:
The server localhost refused to allow this computer to make a connection.
Possible Causes:
The server, while currently connected to the Internet, may not be configured to allow requests.
The server, while currently connected to the Internet, may not be running the requested service (http).
A network firewall (a device which restricts Internet requests), either protecting your network or the network of the server, may have intervened, preventing this request.
Possible Solutions:
Try again, either now or at a later time.
Contact the administrator of the server for further assistance.
Contact your appropriate computer support system, whether the system administrator, or technical support group for further assistance.

How to fix this?