No credentials cache found while validating credentials
It is usually a harmless redundancy in applications which don't require it, so this option is enabled by default. tells pam_krb5to accept the presence of pre-existing Kerberos credentials provided by the calling application in the default credential cache as sufficient to authenticate the user, and to skip any account management checks.tells pam_krb5to obtain credentials using the addresses of the given hosts in addition to the addresses of interfaces on the local workstation.
tells pam_krb5.so, when it attempts to set tokens, to try to get credentials for services with names which resemble [email protected] before attempting to get credentials for services with names resembling afs/[email protected]
tells pam_krb5to not check if a user exists on the local system, to skip authorization checks using the user's .k5login file, and to create ccache files owned by the current process's UID.