Event ID - 5

Event Id5
SourceInterix
DescriptionA user or group id with a value that requires careful Posix Offset management has been encountered. See the Interix documentation for how to deal with this situation. The internal UID is 0x%1%2.
Event InformationAccording to Microsoft:
CAUSE:
Both of these event ID messages may occur if you use either a command line, the Tar.exe utility, or a pax command to input a User identification (UID) or group identification (GID) value from outside the current group of domains as data. If this situation occurs, the event ID 5 message (which is a warning message) occurs if there is enough space between domain offset values message (see the "More Information" section for more details). The event ID 6 message occurs if there is not enough space between domain offset values. In this situation, the subsystem cannot create a unique UID for this user.
RESOLUTION:
You can ignore both of these event ID messages. You can use the psxoffset -uid command to determine whether the UID exists. If the UID does not exist, you do not have to take any action.
Reference LinksMessage Is Logged by Windows Services for Unix 3.0 or Interix 3.0

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