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Source: Microsoft Support
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We are using Identity Lifecycle Manager (ILM) to synchronize data into a target Active Directory Application Mode (ADAM) SP1 instance. When modifying the attribute grouptype in ADAM to set the value 2147483650 we find on reading the value back through ILM 2007 SP2 that we receive value -2147483646. Note that ILM is expecting to receive the same value when reading back the groupType value as that which it was updated with; otherwise the entry always becomes a candidate for modifying even though the "correct" value is already present in the ADAM directory.
This is done in accordance with the following MSDN article where positive values of group type are mentioned:
LDAP stores the groupType Attribute as a Hexadecimal.
2147483650 converts to hexadecimal as 0x80000002 -2147483646 converts to hexadecimal as 0xFFFFFFFF80000002
The business side of the value is the hex value 80000002, while reading from LDAP the remaining nibbles are all Fs thus resulting into the value appearing as -2147483646 in decimal.
If you write -2147483646 to LDAP grouptype, then the written and the read values will match.
Recommended constant values for various group types when writing to ADAM/AD
Domain Local Security Group 0x80000004 (-2147483644)
Domain Local Distribution Group 0x00000004
Global Security Group 0x80000002 (-2147483646)
Global Distribution Group 0x00000002
Universal Security Group 0x80000008 (-2147483640)
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