NTSTATUS 263 (STATUS_SOME_NOT_MAPPED): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: An account-name lookup translated some entries but could not resolve all of them.

Could be also:
Constant	Type	OS
KERNEL_EXPAND_STACK_ACTIVE	BugCheck Code	Windows

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STATUS_NOT_ALL_ASSIGNED	STATUS_OPLOCK_BREAK_IN_PROGRESS

STATUS_SOME_NOT_MAPPED

The batch lookup produced partial identity results

LsaLookupNames2 can return this informational status while still supplying translated SID entries and a referenced-domain list for the names it found. Missing accounts, unavailable trusted domains, stale names, or ambiguous input formatting can affect only part of the batch.

Process each output entry rather than discarding the whole result or treating every item as resolved. Preserve the original name and SID_NAME_USE value, and free returned LSA memory even when the call reports partial mapping.

What to inspect

Match each translated entry to its original input index.
Log unresolved names and the domains that were contacted or referenced.
Free ReferencedDomains and Sids buffers on partial-result paths.

References

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