macOS User Configuration 1. /etc/krb5.conf [libdefaults] default_realm = ABCDEF.COM allow_weak_crypto = false rdns = false [realms] ABCDEF.COM = { kdc = kdc.abcdef.com kdc = kdc2.abcdef.com admin_server = kdc.abcdef.com kpasswd_server = kdc.abcdef.com } 2. /etc/ssh/ssh_config After MacOS update, this configuration usually reset. So after update you must check this configuration. GSSAPIAuthentica..