NetBIOS Applications Stop Receiving Data Running on TCP/IP 32 (156441)
The information in this article applies to:
- Microsoft TCP/IP-32 for Windows for Workgroups 3.11
- Microsoft TCP/IP-32 for Windows for Workgroups 3.11a
- Microsoft TCP/IP-32 for Windows for Workgroups 3.11b
This article was previously published under Q156441 SYMPTOMS
NetBIOS applications running on Microsoft TCP/IP 32 for Windows For
Workgroups may stop receiving data from server-side applications. The
problem will only occur if the client pauses before receiving data for
more than one NetBIOS Session KeepAlive interval.
NOTE: The default NetBIOS Session KeepAlive interval for TCP/IP 32 is 60
minutes.
CAUSE
The problem occurs because of the NetBIOS over TCP/IP Vxd's (VNBT) handling
of Session KeepAlive packets when application data is also pending in TCP.
If VNBT posts a receive for application data pending in TCP and a NetBIOS
Session KeepAlive packet also resides in the TCP pending queue, VNBT would
incorrectly determine the state of the lower TCP connection resulting in
all future NetBIOS Receives being placed in a pending state.
RESOLUTION
Vnbt.386 was modified to correctly handle NetBIOS KeepAlive packets in
TCP's pending queue.
STATUS
Microsoft has confirmed this to be a problem in TCP/IP 32 version 3.11B.
A supported fix is now available, but is not fully regression tested and
should be applied only to systems experiencing this specific problem.
Contact Microsoft Product Support Services for more information.
| Modification Type: | Major | Last Reviewed: | 9/30/2003 |
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| Keywords: | kbbug KB156441 |
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