Hi,
In solaris 5.8,5.9,and 5.10 there is /etc/shadow file contain the password information of all users
LK means account is locked, user cant logged in the server
Some are the reson's are as follows
1) user created and forgot to reset password
2) system admin used the command passwd -l username command
3) in solaris 5.10 if your attempt 5 times wrong password then also your account will be locked if system admin has set in /etc/policy.conf file
to remove LK from /etc/shadow file use the command
1) passwd -d username
2) passwd username
set new password
Thanks