Description of problem: The fix for SECURITY-640 breaks "Continuation Required" logic of the NegotiationAuthenticator and SPNEGOLoginModule. The "Continuation Required" logic is not triggered by all clients. PR for the fix: https://github.com/wildfly/jboss-negotiation/pull/11
PR: https://github.com/wildfly-security/jboss-negotiation/pull/17
Verified in 6.2.4.CP.CR1