Virtual Circuit Error 3193

Last reviewed: May 13, 1997
Article ID: Q109555

The information in this article applies to:

Microsoft Windows NT Advanced Server version 3.1

In a mixed Microsoft NT Advanced Server environment with LAN Manager 2.x and OS/2 1.3, where LAN Manager is the Backup Domain Controller to an Advanced Server Primary Domain Controller, the following error message appears in the error log of the Backup Domain Controller:

   WORKSTATION         3193                11-30-93 08:59pm
   NET3193:  A virtual circuit error occurred on the session to NTSERVER
     The NCB command and return code is the data.
       96 18

This is caused by the Advanced Server parameter Autodisconnect. When an Advanced Server machine Autodisconnects a session, it sends an NBFP Session.End frame with the DATA2 flag (termination indicator) set to 0001 (abnormal) rather than 0000 (normal).

This problem does not occur on LAN Manager OS/2 Primary Domain Controllers. The LAN Manager OS/2 Primary Domain Controller sends a Session.End frame with DATA2 set to 0000.

This Session.End frame is transmitted as a result of a HANG.UP command, a SEND command that timed out, or some abnormal condition.

DATA2 contains the Termination indicator. This two-byte field is used to indicate the type of termination, where X'0000' indicates a normal session end (as a result of a HANG.UP command) and X'0001' indicates an abnormal session end (typically a SEND command has timed out).

The following is an example of an Autodisconnect from an Advanced Server machine disconnecting a session created on the OS/2 BDC.

Frame   Time          MAC Source    MAC Dest Protocol Description
58      321.045       LCSCOTTSU3    FATMON   NETBIOS  Session End (0x18)

+ ETHERNET: 802.3 Length = 60 + LLC: C I-FRAME N(S) = 0x04, N(R) = 0x0E POLL

  NETBIOS: Session End (0x18)
      NETBIOS: Length = 14 (0x000E)
      NETBIOS: Signature = 0xEFFF
      NETBIOS: Command = Session End (0x18)
      NETBIOS: Data2 = 0x0001 (abnormal)<<<This is the Termination

Indicator.

      NETBIOS: Destination Number = 0x21
      NETBIOS: Source Number = 0x03
      NETBIOS: NetBIOS Data: Number of data bytes remaining = 28 (0x001C)

00000:  00 DD 01 0F C3 C8 00 DD 01 0F C2 DA 00 12 F0 F0   ................
00010:  08 1D 0E 00 FF EF 18 00 01 00 00 00 00 00 21 03   ..............!.
00020:  53 52 56 30 31 20 20 20 20 20 20 20 00 4C 43 53   SRV01       .LCS
00030:  43 4F 54 54 53 55 33 20 20 20 20 20               COTTSU3

For more information, see pages 5-31 of the IBM "Local Area Network Technical Reference."

Additional query words: prodnt
Keywords : kbbug3.10 kbusage nthowto
Version : 3.1
Platform : WINDOWS

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: May 13, 1997
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.