Microsoft KB Archive/150047

= NetWare Drives Inaccessible to CIM and MMTA =

Article ID: 150047

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q150047





SYMPTOMS
When multiple processes contend for a drive resource through the Novell NetWare redirector (NWRDR), applications may intermittently fail to access the drive resource.

For example, when you use the Windows NT Multitasking MTA (message transfer agent) (MMTA) configured with Compaq Insight Manager, the MMTA may fail when it attempts to connect to Microsoft Mail postoffices installed on a NetWare server. If this happens, the drive resource cannot be accessed until Client Services for NetWare is restarted or the system rebooted. Failure may also occur if, while the MMTA is accessing dynamic drives for data, you select a drive in File Manager or perform various file I/O using another process.

When the MMTA tries to use an inaccessible drive for connecting to the postoffices on NetWare servers, the following error message may be displayed continuously:

NT MMTA:

Drive is used, local, or greater than last drive

When you try to connect to a NetWare server from the command prompt or batch file, the following error may be displayed:

C:\users\default>net use X: \\NetwareServer\share

System error 85 has occurred. The local device name is already in use.

The MMTA service operates successfully as long as another process does not create a drive-access conflict. Also, the problem does not occur when you connect to Microsoft Mail postoffices located on Microsoft Windows NT servers accessed through the Server Message Block (SMB) redirector.

NOTE: Although this example discusses File Manager, Compaq Insight Manager, and MMTA for Windows NT, the problem can occur with other applications operating on Windows NT using Client Services for NetWare and NWRDR.



CAUSE
During drive connection and disconnection I/O, the Windows NT CSRSS drive table entry representing the NetWare drive connection becomes corrupted. A NetWare client connection established under one process, such as the MMTA, cannot be accessed by another process, such as through File Manager; if access is attempted, an Access Denied message will be returned. The NWRDR on Client Services for NetWare assigns a separate user context for each process. This is not true for the SMB redirector, RDR (redirector). When multiple processes begin to contend for a drive, the drive table entry can become corrupted. Contention can occur for a number of reasons. The Windows NT MMTA connects and disconnects dynamic drive resources. CIM periodically accesses drive resources to obtain information. Also, File Manager can be used to access drive resources.

Any of these operations accessing a common drive resource simultaneously can result in drive resource contention. If a failure occurs, Client Services for NetWare must be restarted to access the orphaned drive letter. The drive resource can no longer be accessed even though the drive appears to be available.



RESOLUTION
Basesrv.dll has been corrected to prevent NetWare drive resources from becoming orphaned or corrupted.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51. This problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K



MORE INFORMATION
For additional information, please see the following articles in the Microsoft Knowledge Base:

148348PC NTMMTA MMTA: Fails with Compaq Insight Manager

146122PC NTMMTA: Error 2140 When You Try to Start Instance

Additional query words: 3.51 prodnt

Keywords: kbnetwork KB150047

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