ERROR: 1851 "port in use" on Citrix/terminal server for additional remote administrators

  • 3021901
  • 21-Aug-2007
  • 30-Apr-2012


Novell ZENworks 7 Server Management Support Pack 1 - ZSM7 SP1
Novell ZENworks 7 Desktop Management Support Pack 1 - ZDM7 SP1 Remote Management
Citrix MetaFrame Presentation Server version 4, being hosted on a 2003 server
Note: Citrix MetaFrame Presentation Server version 3, being hosted on a 2000 server reportedly does not have this problem.


Using ConsoleOne to start more many simultaneous Remote Control session on Citrix Terminal Sessions may generate ERROR: 1851. Remote Control is not run in listening mode.


Fixed in ZENworks 7 Desktop Management Service Pack 1 Interim Release 3a, see KB 3484245 "Updates to Novell ZENworks 7 Desktop Management" which can be found at
The following entry needs to be created on the server for the fix to work:
Key: HKLM\Software\Novell\ZENworks\RemoteManagement\RCListener
Name: SuppressPortConflictMessage
Value: 1

Additional Information

In listening mode, this error is expected and valid. Please see the documentation for more information about Error 1851 in listening mode. See TID3691599for information on usingDesktop4.exe on a terminal server.