Microsoft KB Archive/170095

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ILS: ILS Service Crashes on Multi-processor Servers

Article ID: 170095

Article Last Modified on 11/17/2003


  • Microsoft Site Server 2.0 Standard Edition
  • Microsoft Internet Information Services Internet Locator Server 1.0
  • Microsoft Commercial Internet System 1.0 Service Pack 2

This article was previously published under Q170095


If a multiprocesor computer is under load, Internet Locator Server (ILS) may randomly experience access violations.


The ILS database may be corrupted due to a data pointer being freed without the corresponding database entry being deleted. As a result, another thread finds the entry in the database, and tries to access the data which causes an access violation to occur.

Another problem was found when adding a user if the user already existed in the database, and certain conditions were met to re-add the user (that is, the correct password was passed in). The server reuses the same base user record. The problem occurs because data pointers are reallocated without first checking to see if the record is currently being used by another thread. As a result, the thread currently accessing the entry experiences an access violation when it attempt to read memory that has already been freed.


Microsoft has confirmed this to be a problem in Microsoft Site Server version 2.0.

This problem has been corrected in the latest U.S. Service Pack for Microsoft Site Server version 2.0. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):


Additional query words: prodmcis

Keywords: kbbug kbpending KB170095