This article was previously published under Q179873
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Files opened with a UNC name may be closed prematurely. This problem onlyoccurs when a directory that is part of the UNC path is subsequentlyconnected and then disconnected.
When the UNC file is opened, a tree ID is created by the server and is sentto the client Redirector. The tree ID represents the root or mount point onthe server. In the above example, a tree ID will be returned for thedirectory dir. For file references, the Redirector includes the tree ID totell the server where the path starts on the server. A tree ID has to beobtained before files can be accessed on the server. A tree ID is alsoneeded to access a directory mapped to a drive letter. For optimization,the server will return the same tree ID for both accesses. The problemoccurs on the net use /d. The Redirector will send a tree disconnectrequest to the server. This request closes all files in the tree, evenfiles opened with UNC names.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.