Reset pam module login counters

pam_tally_reset.txt

### On RHEL5 servers ###
1. Check the login failure count
pam_tally --user username
2. Reset the login failures
pam_tally --user username --reset
3. Retry logging in.

### On RHEL6 and RHEL7 servers ###
1. Check the login failure count
pam_tally2 --user username
2. Reset the login failures
pam_tally2 --user username --reset
3 Retry logging in.

### Important Notes ###
1. It is important to find out the root cause of login failures instead of resetting the login counter on a regular basis.
2. Usually, RHEL6 and RHEL7 servers in the environment should be able to automatically reset the counters after a specified amount of time, given that there are no more recent failed logins. This can be verified via the files below.
/etc/pam.d/login
/etc/pam.d/system-auth