Index: src/main/java/org/jboss/security/negotiation/spnego/SPNEGOLoginModule.java
===================================================================
--- src/main/java/org/jboss/security/negotiation/spnego/SPNEGOLoginModule.java	(revision 97895)
+++ src/main/java/org/jboss/security/negotiation/spnego/SPNEGOLoginModule.java	(working copy)
@@ -100,6 +100,14 @@
          return true;
       }
 
+      if(!NegotiationContext.isDefined())
+      {
+         log.info("Negotiation context not defined, failed SPNEGO authentication " +
+         		"or browser chose lesser authentication mechanism");
+         
+         return false;
+      }
+      
       super.loginOk = false;
 
       NegotiationContext negotiationContext = NegotiationContext.getCurrentNegotiationContext();