XCON: MTA Heap Corruption With Misconfigured TP4/TCP Connection
Article ID: 152951
Article Last Modified on 10/28/2006
APPLIES TO
- Microsoft Exchange Server 4.0 Standard Edition
This article was previously published under Q152951
SYMPTOMS
The Microsoft Exchange Message Transfer Agent (MTA) may experience heap
corruption if there is a misconfigured incoming TCP/IP or TP4 connection.
The heap corruption will exhibit itself as Dr. Watson errors in the MTA.
CAUSE
Microsoft Exchange Server is leaking buffers from SBPDSACP in the WinSock
code. WINSOCK DMOD (TP4/TCP) creates too many threads when many connections
are started and stopped. Threads of different types (TP4/TCP) can be
created on the same Thread Control Block (CB) causing two WINSOCK threads
to update the pointers in a select call simultaneously. This can cause heap
corruption.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 4.0. This problem was corrected in the latest Microsoft Exchange
Service Pack. For information on obtaining the Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):
Additional query words: Dr. Watson Crash
Keywords: kbbug kbfix kbusage KB152951