Linux Disables TTY terminal login

Modify File/etc/pam.d/system-auth

#%pam-1.0
# This file is auto-generated.
# User changes'll be destroyed the next time Authconfig is run.
#auth Required Pam_env.so
#auth sufficient pam_unix.so Nullok Try_first_pass
#auth requisite pam_succeed_if.so uid >= quiet
#auth Required Pam_deny.so
#
Auth Required pam_env.so
Auth Required pam_tally.so onerr=fail per_user deny=3 unlock_time=60
Auth sufficient pam_unix.so Try_first_pass
Auth Required pam_deny.so
#
#account Required Pam_unix.so
#account sufficient pam_succeed_if.so UID < quiet
#account Required Pam_permit.so
Account Required Pam_tally.so
Account Required Pam_unix.so
Account sufficient pam_succeed_if.so UID < quiet
Account Required Pam_permit.so
#
#password requisite pam_cracklib.so try_first_pass retry=3 lcredit=-2 ucredit=-2 dcredit=-2 ocredit=-2
#password sufficient pam_unix.so MD5 shadow Nullok try_first_pass Use_authtok remember=5
#password Required Pam_deny.so
Password requisite pam_cracklib.so minlen=7 ucredit=-2 lcredit=-1 dcredit=-1 ocredit=-2 retry=3
Password sufficient pam_unix.so Use_authtok MD5 shadow remember=5
Password Required pam_deny.so
#
#session Optional pam_keyinit.so Revoke
#session Required Pam_limits.so
#session [Success=1 Default=ignore] pam_succeed_if.so service in Crond quiet Use_uid
#session Required Pam_unix.so
# #Set account retries to three for GEN000460
#account Required pam_tally.so deny=3 no_magic_root Reset
Session optional Pam_keyinit.so Revoke
Session Required Pam_limits.so
session [Success=1 Default=ignore] pam_succeed_if.so service in Crond quiet Use_uid
Session Required Pam_unix.so

Linux Disables TTY terminal login