DLC Printers Show "Status Unknown" After Restarting Spooler

   Event ID: 1002
   Source:   hpmon
   Type:     Error
   Category: None

   OpenAdapter failed with error (0x015E). Make sure the DLC protocol is
   properly installed.

   Event ID: 1050
   Source:   hpmon
   Type:     Error
   Category: None

   The DLC protocol is not loaded. Make sure the DLC protocol is properly
   installed.
				

RESOLUTION

WARNING: Using Registry Editor incorrectly can cause serious system-wide problems that may require you to reinstall Windows NT. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

To change the adapter selected back to primary (0):

1. Run the Registry Editor (Regedt32.exe).
2. Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey:
   \SYSTEM \CurrentControlSet \Control \Print \Monitors \Hewlett-Packard Network Port \Optio
3. Double-click Adapter:REG_DWORD:0x1.
4. In the DWORD Editor dialog box, change data from 1 to 0 and click OK.
5. Exit Regedt32.exe.
6. Stop and restart the spooler service.