diff --git a/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/KerberosTicketValidation.java b/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/KerberosTicketValidation.java
index e9a7182..d2a49ae 100644
--- a/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/KerberosTicketValidation.java
+++ b/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/KerberosTicketValidation.java
@@ -6,6 +6,7 @@ import javax.security.auth.Subject;
 import javax.security.auth.kerberos.KerberosPrincipal;
 
 import org.ietf.jgss.GSSContext;
+import org.ietf.jgss.GSSCredential;
 
 /**
  * Result of ticket validation
@@ -16,8 +17,13 @@ public class KerberosTicketValidation {
 	private final Subject subject;
 	private final byte[] responseToken;
 	private final GSSContext gssContext;
+	private final GSSCredential delegationCredential;
 
 	public KerberosTicketValidation(String username, String servicePrincipal, byte[] responseToken, GSSContext gssContext) {
+		this(username, servicePrincipal, responseToken, gssContext, null);
+	}
+
+	public KerberosTicketValidation(String username, String servicePrincipal, byte[] responseToken, GSSContext gssContext, GSSCredential delegationCredential) {
 		final HashSet<KerberosPrincipal> princs = new HashSet<KerberosPrincipal>();
 		princs.add(new KerberosPrincipal(servicePrincipal));
 
@@ -25,14 +31,19 @@ public class KerberosTicketValidation {
 		this.subject = new Subject(false, princs, new HashSet<Object>(), new HashSet<Object>());
 		this.responseToken = responseToken;
 		this.gssContext = gssContext;
+		this.delegationCredential = delegationCredential;
 	}
 
-
 	public KerberosTicketValidation(String username, Subject subject, byte[] responseToken, GSSContext gssContext) {
+		this(username, subject, responseToken, gssContext, null)
+	}
+
+	public KerberosTicketValidation(String username, Subject subject, byte[] responseToken, GSSContext gssContext, GSSCredential delegationCredential) {
 		this.username = username;
 		this.subject = subject;
 		this.responseToken = responseToken;
 		this.gssContext = gssContext;
+		this.delegationCredential = delegationCredential;
 	}
 
 	public String username() {
@@ -51,4 +62,7 @@ public class KerberosTicketValidation {
 		return this.subject;
 	}
 
+	public GSSCredential getDelegationCredential() {
+		return delegationCredential;
+	}
 }
\ No newline at end of file
diff --git a/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/sun/SunJaasKerberosTicketValidator.java b/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/sun/SunJaasKerberosTicketValidator.java
index 3a24373..14e3720 100644
--- a/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/sun/SunJaasKerberosTicketValidator.java
+++ b/spring-security-kerberos-core/src/main/java/org/springframework/security/kerberos/authentication/sun/SunJaasKerberosTicketValidator.java
@@ -64,6 +64,7 @@ public class SunJaasKerberosTicketValidator implements KerberosTicketValidator,
     private boolean holdOnToGSSContext;
     private boolean debug = false;
     private boolean multiTier = false;
+    private boolean refreshKrb5Config = false;
     private static final Log LOG = LogFactory.getLog(SunJaasKerberosTicketValidator.class);
 
     @Override
@@ -104,7 +105,8 @@ public class SunJaasKerberosTicketValidator implements KerberosTicketValidator,
                 this.servicePrincipal,
                 this.realmName,
                 this.multiTier,
-                this.debug);
+                this.debug,
+                this.refreshKrb5Config);
         Set<Principal> princ = new HashSet<Principal>(1);
         princ.add(new KerberosPrincipal(this.servicePrincipal));
         Subject sub = new Subject(false, princ, new HashSet<Object>(), new HashSet<Object>());
@@ -180,7 +182,14 @@ public class SunJaasKerberosTicketValidator implements KerberosTicketValidator,
         this.holdOnToGSSContext = holdOnToGSSContext;
     }
 
-
+    /**
+     * Enables configuration to be refreshed before the login method is called.
+     *
+     * @param refreshKrb5Config Set this to true, if you want the configuration to be refreshed before the login method is called.
+     */
+    public void setRefreshKrb5Config(boolean refreshKrb5Config) {
+        this.refreshKrb5Config = refreshKrb5Config;
+    }
 
     /**
      * This class is needed, because the validation must run with previously generated JAAS subject
@@ -249,6 +258,12 @@ public class SunJaasKerberosTicketValidator implements KerberosTicketValidator,
                 }
                 first = false;
             }
+
+            GSSCredential delegationCredential = null;
+            if (context.getCredDelegState()) {
+                delegationCredential = context.getDelegCred();
+            }
+
             if (!holdOnToGSSContext) {
                 context.dispose();
             }
@@ -271,13 +286,15 @@ public class SunJaasKerberosTicketValidator implements KerberosTicketValidator,
         private String realmName;
         private boolean multiTier;
         private boolean debug;
+        private boolean refreshKrb5Config;
 
-        public LoginConfig(String keyTabLocation, String servicePrincipalName, String realmName, boolean multiTier, boolean debug) {
+        public LoginConfig(String keyTabLocation, String servicePrincipalName, String realmName, boolean multiTier, boolean debug, boolean refreshKrb5Config) {
             this.keyTabLocation = keyTabLocation;
             this.servicePrincipalName = servicePrincipalName;
             this.realmName = realmName;
             this.multiTier = multiTier;
             this.debug = debug;
+            this.refreshKrb5Config = refreshKrb5Configx
         }
 
         @Override
@@ -296,6 +313,10 @@ public class SunJaasKerberosTicketValidator implements KerberosTicketValidator,
                 options.put("realm", realmName);
             }
 
+            if(this.refreshKrb5Config) {
+                options.put("refreshKrb5Config", "true");
+            }
+
             if (!multiTier) {
                 options.put("isInitiator", "false");
             }