can't scan some computers

[BobbyChui]

most of computers are ok ,but some computer failed ,(total:7000; 6500 ok ,but 100 failed)

the failed computer ,test the computer from server ,test ok , no error :
Remote WMI test ok;
Remote Registry test using WMI test ok.

but run "lsclient.exe 10.10.1.159" in client
connect server failed .
why???

[Rboynton]

If I may ask, how were these problem PC's built? Were they built from scratch, through a properly sysprepped image, or were they cloned off of a "master" hard drive using a disk cloning program?

[Hemoco]

Do these computers have a firewall that blocks outbound traffic?
Are you able to telnet to the server port 9524 (10.10.1.159)?
Is the service on 10.10.1.159 still running?