Reconnecting Through the Serial Port Hangs Pentium Computers (114767)
The information in this article applies to:
- Microsoft Windows NT Server 3.1
- Microsoft Windows NT Workstation 3.1
- Microsoft Windows NT Advanced Server 3.1
This article was previously published under Q114767 SYMPTOMS
On a Pentium-based computer, when you start a serial communications
program, make a connection, exit the communications program, restart the
communications program and attempt to make a connection again, Windows NT
stops responding (hangs), requiring a hardware reset.
CAUSE
When SERIAL.SYS attempts to simultaneously put the 16550 UART serial port
controller into FIFO mode and clear the data in the receive buffer when it
already is in FIFO mode and has data in the buffer, the LSR incorrectly
continues to think that there is data in the receive buffer even after you
read the data register. This hangs the computer at the hardware level.
STATUS
Microsoft has confirmed this to be a problem in Windows NT and Windows NT
Advanced Server version 3.1. This problem has been corrected in the latest
U.S. Service Pack for Windows NT and Windows NT Advanced Server version
3.1. For information on obtaining the Service Pack, query on the following
word in the Microsoft Knowledge Base (without the spaces):
| Modification Type: | Major | Last Reviewed: | 11/20/2003 |
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| Keywords: | kbother KB114767 |
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