DLC Connections Fail to Restart after Outage

ID: Q247353

The information in this article applies to:

Microsoft SNA Server, versions 2.11 (all SP), 3.0 (all SP), 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3

SYMPTOMS

If a network problem causes an SNA Server DLC 802.2 connection to fail (causing event ID 23 to be logged by SNA Server), the connection should automatically recover to an "Active" state after the problems are gone. However, under certain conditions, the connection may not recover, and the status may stay at "Pending" when you use one of the following token ring adapters:

IBM 16/4 Token-Ring PCI Adapter 2

IBM 16/4 Token-Ring PCI Adapter

Compaq Netelligent Token-Ring Adapter

Compaq Netflex Token-Ring Adapter

CAUSE

This problem is caused by the IBM token ring driver Ibmtrp.sys, dated 11/4/96 (version 1.08). This problem is described on the IBM Web site; for information, go to the following location:

http://app-01.www.ibm.com/support/support_doc/nhd/s0002/body/13554.shtml

The Ibmtrp.sys driver is used for the following network adapters:

IBM 16/4 Token-Ring PCI Adapter 2

IBM 16/4 Token-Ring PCI Adapter

Compaq Netelligent Token-Ring Adapter

Microsoft is not aware of a fix for the Compaq Netflex Token-Ring Adapter, which uses a different driver.

Note that Microsoft is not able to confirm that a switch is failing when this problem occurs. The DLC connections drop (indicated by the SNA Server Event 23 Outage xAF errors), and at the time of the failures, network errors are occurring (Token Ring soft errors). Updating the driver allows the connections to recover after an outage.

RESOLUTION

Update the token ring driver (Ibmtrp.sys) to version 2.22, dated 7/21/97 or later.

STATUS

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

The third-party contact information included in this article is provided to help you find the technical support you need. This contact information is subject to change without notice. Microsoft in no way guarantees the accuracy of this third-party contact information.

MORE INFORMATION

The outage that initiated the problem is logged in the Application event log as event ID 23 with an outage code of 0xAF. This event is almost always an indicator of a network problem.

The token ring re-insertion problem is not specific to DLC connectivity. In a lab environment, the problem was recreated with the PING utility over IP.

Additional query words:

Keywords :
Version : WINDOWS:2.11 (all SP),3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3
Platform : WINDOWS
Issue type : kbprb