KB149802 - Assigning 3270 LUs to Workstations Using SNA Server Client

MORE INFORMATION

SNA Server version 2.x does not provide a centralized method of assigning LUs to workstations. The SNA Server Admin does allow the assignment of LUs to a particular user or group. The local LU feature implemented in SNA Server client software can be used to limit which LUs can be used on the client computer, and it can be used to implement LU assignment to a workstation.

The following procedure can be implemented on an MS-DOS, Microsoft Windows 3.x, Microsoft Windows NT, and Microsoft Windows 95 client.

NOTE: The steps that are platform dependent will identify the procedure to follow for each component.

Determine what LUs will belong to which workstations, and what users will be using each workstation.
Using SNA Admin, assign specific LUs to the users or groups that they will be accessing from these workstations. The assignment of LU pools is not supported when you implement this specific procedure.
In the SNA client configuration, specify the specific LUs that the workstation will be limited to, using the LocalLU parameter:

MS-DOS clients

Open the Sna.ini file on each MS-DOS workstation using Edit.com or similar text editor.
Add the following entry in the [SnaBase] section of the Sna.ini file:
```
        LocalLUS=<LocalLUName1> <LocalLUName2> ... <LocalLUNamex>
						
```
where <LocalLUNamex> are LU names separated by spaces.
Close and save the Sna.ini file.

Windows 3.X/Windows for Workgroups clients

Make a backup of the Win.ini file. Open the Win.ini file from the Windows root directory using Notepad.
Add the following entry in the [Wnap] section of Win.ini:
```
        LocalLUS=<LocalLUName1> <LocalLUName2> ... <LocalLUNamex>
						
```
where <LocalLUNamex> are LU names separated by spaces.
Close and save the Win.ini file.

Windows NT clients

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

Run the Registry Editor (Regedt32), and locate the following key:

        HKEY_LOCAL_MACHINE
            SYSTEM
                 CurrentControlSet
                     Services
                         SnaBase
                             Parameters

Add the following value to the Registry key:

        Value Name: LocalLUS
         Data Type: REG_MULTI_SZ
              Data: <LocalLUName1> <LocalLUName2> ... <LocalLUNamex>

where <LocalLUNamex> are LU names separated by spaces.

Close the Registry Editor.

Windows 95 clients

Run the Registry Editor (REGEDIT), and locate the following key:

         HKEY_LOCAL_MACHINE
             SOFTWARE
                 Microsoft
                     SnaBase
                          Parameters

Add the following string value to the Registry key:

        String Value Name: LocalLUS
                     Data: <LocalLUName1> <LocalLUName2> ...<LocalLUNamex>

where <LocalLUNamex> are LU names separated by spaces.

Close the Registry Editor.

After you follow these steps, run the 3270 application. The list of available LUs for that workstation should match those entered in the LocalLUS parameter. If you do not have access to the LU chosen, the emulator should report an error. To correct this problem, add the LU to the user (or group) record in SNA Admin.

This procedure should affect all emulators that use the SNA Server client.

The problems of assigning LUs to workstations with this method are the following:

Station is limited to the LUs listed; no matter what user is signed on.
Security for a broad range of LUs must be assigned to all users.
The administrator is responsible for securing the Win.ini file (Windows 3.x), SNA.INI (MS-DOS), or the Registry (Windows 95, Windows NT) against users wishing to broaden their LU selection.

NOTE: There is currently a problem assigning Printer LUs. At present, Printer LUs are mapped to Display LUs by mistake.