Registrations are now open. Join us today!
There is still a lot of work to do on the wiki yet! More information about editing can be found here.
Already have an account?

Microsoft KB Archive/159745

From BetaArchive Wiki
Knowledge Base

CWBSY1000 Communication Error w/ Client Access for Windows 95/NT

Article ID: 159745

Article Last Modified on 11/26/2003


  • Microsoft SNA Server 2.0
  • Microsoft SNA Server 2.1
  • Microsoft SNA Server 3.0
  • Microsoft SNA Server 2.11 Service Pack 1
  • Microsoft SNA Server 3.0 Service Pack 4

This article was previously published under Q159745


If you are using an SNA Server as the communications provider for IBM Client Access for Windows 95 or Windows NT, the Local APPC LU alias must be defaulted in the SNA Server because Client Access does not specify the Local APPC LU alias when opening a conversation to the AS/400. Without this configuration, Client Access for Windows 95 and Windows NT will not be able to connect to any AS/400 systems. The following error message will be displayed on the client computer:

CWBSY1000 - Communication error while validating security information on system <AS400_System_Name>


There are two methods you can use to configure the local LU name. Both methods are in the SNA Server Administrator program and not on the clients.

  • Select the "Member of Default Outgoing Local APPC LU Pool" check box on the Local APPC LU Properties dialog box for at least one of the local LUs. This allows workstations that do not specify a local LU to connect to an AS/400 system using one of the LUs configured in this manner.


  • Assign each user or group a specific local LU. In the Properties dialog box for each user or group listed in the Users and Groups window, select the "Default Local APPC LU" check box..

For additional information please see the README file included with IBM Client Access for Windows 95 and Windows NT.


This error will also be documented in the History.hst file located in the Program Files\ibm\Client Access\Service directory, and in the application log of the Event Viewer as stated below (note that the LU alias is blank).

   Event Id 93

   APPC local conversation start failed:

   Primary_rc   = F004
   Secondary_rc = 020000F0
   TP_ID        = 0100000098265200
   Dest TP name = 06F3F0F1
   LU alias     =
   PLU alias    = <AS400_System_Name>
   Mode name    = D8D7C3E2E4D7D740

   An attempt to start an APPC conversation locally using the verb
   [MC_]ALLOCATE failed.

   Refer to the "Microsoft SNA Server APPC Programmer's Guide" for
   about the displayed primary_rc and secondary_rc values.

The third-party products discussed here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: AS/400 CA/400

Keywords: kbsetup kbui kb3rdparty KB159745