I have vcenter appliance joined to active directory for authetication.
Now my domain user (in this case administrator) it is locked.

From shell vcenter appliance :

srvvcenter5:~ # faillog -u Domain\administrator
Login       Failures Maximum Latest                   On
Domainadministrator      17        0   09/18/12 10:01:05 +0200  unknown

I want reset Failures count :

srvvcenter5:~ # pam_tally –user Domain\administrator –reset
User Domainadministrator       (1331692020)    had 17
and now:

srvvcenter5:~ # faillog -u Domain\administrator
Login       Failures Maximum Latest                   On
Domainadministrator       0        0   09/18/12 10:01:05 +0200  unknown