Invalid File Handle with SP4 Nwrdr.sys (151432)
The information in this article applies to:
- Microsoft Windows NT Server 3.51
This article was previously published under Q151432 SYMPTOMS
The following message occurs in File Manager when you attempt to browse
directories on a Novell NetWare 3.11 or 3.12 server volume:
Invalid File Handle
CAUSE
A check was put into the Service Pack 4 version of Client Services for
NetWare (CSNW) because of the possibility of a NetWare Server assigning a
duplicate directory handle. This fix caused a regression in Windows NT
because it did not differentiate between directory handles and print queue
IDs.
RESOLUTION
Check each Volume Control Block (VCB) to determine whether it is a print
queue or not before invalidating the handles.
MORE INFORMATION
CSNW uses a single DWORD union to represent directory-specific or printer-
specific information in its record of a mapping, or Volume Control Block
(VCB). The value in the union depends on the resource type for that VCB;
the resource type can be either print or disk. The fix for duplicate
directory handle assignment did not check the resource type. Therefore a
print queue ID of 0xf903004f would also appear to represent a directory
handle of 0x3, because the second byte in the union represents a directory
handle if the resource type is disk.
In the example above, if a disk resource mapping results in a NetWare
server allocating a Directory Handle of 3, then both the new directory
handle and the second byte of the existing print queue ID would be
invalidated with an FF(-1). Subsequent commands sent to the NetWare server,
using FF for a file handle, result in the Invalid File Handle message and
the remapping of the Disk resource connection. This invalidation also has
the effect of changing the print queue ID. This causes print failures,
because it is likely that the resulting print queue ID the client attempts
to use does not exist.
STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51
with Service Pack 4. 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):
| Modification Type: | Major | Last Reviewed: | 8/8/2001 |
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| Keywords: | KB151432 |
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