PRB: NetBIOS Command NCBSEND Gets Return Code Error 0x3C (123457)
The information in this article applies to:
- Microsoft Platform Software Development Kit (SDK) 1.0
- Microsoft Win32 Software Development Kit (SDK) for Windows NT 3.5
This article was previously published under Q123457 SYMPTOMS
While opening sessions, you start to get error 0x3C (lock of user area
failed) in the NcbSend command call.
CAUSE
An application in Windows NT uses the NcbListen command to accept NetBIOS
calls. After a call is received, the application uses the NcbSend command
to send data back.
If the computer running Windows NT has 32 megabytes of main memory, an
application can request a large number (for example, 128) of sessions, by
using the NcbReset command, without difficulty.
However, with only 16 megabytes of main memory, an application can request
only a moderate number (for example, 80) of sessions. If more sessions are
opened they start to get error 0x3C (lock of user area failed) in the
NcbSend command call. The error persists until some of the sessions that
are currently open are closed, at which time NcbSend will get a good return
status.
STATUS
This behavior is by design. The system stops the process from using so many
resources that it jeopardizes the performance of other applications and/or
the system itself.
| Modification Type: | Minor | Last Reviewed: | 7/11/2005 |
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| Keywords: | kbAPI kbNetBIOS kbnetwork KB123457 |
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