NTLM Global group Synchronization Error_Access is denied

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Hello,We are using Enterprise Server 9.7 (9.7.0) and Directory Service 3.0.0.NTLM authentication and synchronization is configured.Local group which includes Global group and members is set up to add external members to LL.User name style is NT-style username.While synchronizing the local group, it can sync members successfully but cannot sync global group,ended with bellow error:Synchronizing Domain\Global_groupFound group 'Domain\Global_group' in NTLM with ID 53285Synchronization completed with error: Access is denied.Did any one meet such error?Any clues for the error is much appreciated.Thanks,Ally