Here’s the process to restore Winbind.

Restore old config.

cp /etc/sssd/sssd.conf-xxxxxxx /etc/sssd/sssd.conf
cp /etc/krb5.conf-xxxxxxx /etc/krb5.conf

Disable SSSD. Authconfig creates /etc/nswitch.conf.

authconfig --disablesssd --disablesssdauth --updateall

Start Winbind.

service winbind start; service smb start; service nmb start