I have been having a problem when users logon to Windows XP computers.

* eDirectory server - NetWare6.5SP7
* ZCM10SP1 32bit on Windows 2003 R2 SP2 32bit
* Windows XP clients with Novell Client 4.91sp4

Users can login by typing username and password on Novell Client when logon to XP but ZCMAgent login pops up after Novell Client Login intermittently.
This happens even on IT administrators who has got administrator power on both eDirectory and ZCM10SP1 but not always.

It seems the communication between ZCM10 and eDirectory is not smooth.

Users can logon by typing password on ZCMagent login screen but they have to type more than few times sometimes. Furthermore, they just cancel it from and XP computers works without ZCMagent that is not good.

Could you tell me what the possible cause of this issue, pls?
This issue occurs intermittently regardless the computer or location.