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Event ID: 1021 Source: NfsSvr

There was a mapping failure.
From a support forum: "The default value of SecurehandleLevel setting is also known to hide
subdirectories and files sometimes. Set that to 0 and see if that  helps in anyway.  The registry setting can be located here - HKLM\System\CurrentControlSet\Services\NfsSvr\Parameters\SecureHandleLevel
(DWORD). You need to restart the Server for NFS service changing it.

You can read more about this here - TB463205 - Performance Tuning Guidelines for Microsoft Services for Network File System."

See also IBM Doc id ssg1S1001525.
See ME890745 for a hotfix applicable to Microsoft Windows Services for UNIX 3.5.

See the link to "NFS Authentication" for information on the Network File System (NFS) environment.

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