Previously, when mutual authentication was not requested by the Kerberos 5 initiator, there was no mechanism to negotiate the acceptor's initial sequence number. With this release, if the system property `sun.security.krb5.acceptor.sequence.number.nonmutual` is set to `initiator`, the SunJGSS provider will use the initiator's initial sequence number as the acceptor's initial sequence number. If set to `zero` or `0`, 0 is used. The default value is `initiator`. All other values are illegal and will throw an Error when the system property is read.