    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1653          01/08/97

    TITLE:  Login Problems with Windows NT, v3.5x

    ISSUE

       If Service Pack 4 or 5 was installed previous to upgrading from 1
       to 2 CPUs, or downgrading from 2 to 1 CPUs, or Restoring an
       initial configuration via the Repair Disk, then one of the
       following Logon error messages may appear:

       * The system cannot log you on [80000005]
         Please try again or consult your system administrator.

       * Unable to log you on because the netlogon service
         failed to start.

       * The system cannot log you on [C0000037]. Please try
         again or consult your system administrator.

       * The From drop-down list box is blank. No computer or
         domain name appears.

       This issue affects all multi processor systems except the
       Manhattan SMP.

    BACKGROUND

       After you install Windows NT 3.51 Service Pack 4 or 5, the SAM
       and Security database hives are updated to a new format. This new
       format requires the new SAMSRV.DLL that ships with Service Pack 4
       and 5, and it is not backward- compatible with the earlier
       versions of SAMSRV.DLL.

       The following is an important notice included in the Readme.txt
       of the Windows NT 3.51 Service Pack 4:

       When using the Windows NT Emergency Repair Disk to repair your
       Windows NT system after applying the Service Pack, do not repair
       the file SAMSRV.DLL. If it is necessary to repair this file
       because it has become corrupt, you must replace it with the
       Service Pack version of the file.

       This is necessary because the Service Pack update process changes
       the user database, and the Service Pack version of SAMSRV.DLL is
       needed to allow the system to function properly.

    ACTION

       To correct this problem, do one of the following:

       1. If Windows NT is installed on a FAT partition, replace
          SAMSRV.DLL in the %SystemRoot%\System32 directory with
          the SAMSRV.DLL in Service Pack 4.

          OR

       2. If Windows NT is installed on an NTFS partition,
          re-install Windows NT to a separate directory. Log on
          as the same user with same permissions and relace
          SAMSRV.DLL in the %SystemRoot%\System32 directory with
          the SAMSRV.DLL in the Service Pack 4.

          OR

       3. Restore the SAM and SECURITY database system hives
          from the last Windows NT Backup performed prior to the
          installation of Windows NT Service Pack 4. This
          restores the SAM and Security databases to the format
          prior to the update of Service Pack 4. This format is
          compatible with the original Windows NT 3.51 (Build
          1057) system files.

       WARNING: This procedure may result in loss of any new users,
       groups and trust relationships created since the previous backup.
       You should only follow this procedure as the last resort.

          OR

       Modify the contents of the emergency repair disk (ERD) by doing
       the following:

       1. Remove the attributes from the SETUP.LOG file by
          typing the following at the commandline:

             attrib -r -h -s a:\SETUP.LOG

       2. In Setup.log, add the following line to the
          files .WinNt section:

            \%SystemRoot%\System32\Samsrv.dll =
           "samsrv.dll","316d3","\", (continued line) "nt351
            repair disk","samsrv.dll"

       3. Copy SAMSRV.DLL from the Windows NT 3.51 Service Pack
          4 source media to the root directory of the ERD.

       4. Restart your computer with the three Windows NT 3.51
          Setup disks.

       5. Select R to Repair your Windows NT.

       6. Select only "Verify Windows NT System Files" and
          continue.

       7. If prompted to insert Windows NT setup disk #4, press
          the [ESC] key to continue with the Repair process.

       8. After you replace SAMSRV.DLL with the file from
          Windows NT 3.51 Service Pack 4, press the [F4] key to
          exit Repair. Reboot the computer and restart Windows
          NT.

    NOTES

       N/A

    TAN TPR 3200AC

    ---------------------------------------------------------------------
    The information in this data sheet is subject to change without
    notice. AST Research, Inc. shall not be liable for technical or
    editorial errors or omissions contained herein; nor for incidental or
    consequential damages resulting from the furnishing, performance,
    or use of this material. This material contains information protected
    by copyright. No part of this material may be reproduced in any form
    without prior written consent from AST Research, Inc.
    All rights reserved.
    ---------------------------------------------------------------------
    Revision 01