Index: lams_common/src/java/org/lamsfoundation/lams/integration/security/Authenticator.java
===================================================================
diff -u -rd9562e031bdfad9636e7ba4d47ae3b4417cd22f7 -r66d8c0867b8f221842d7c09b755ee205bb121b33
--- lams_common/src/java/org/lamsfoundation/lams/integration/security/Authenticator.java	(.../Authenticator.java)	(revision d9562e031bdfad9636e7ba4d47ae3b4417cd22f7)
+++ lams_common/src/java/org/lamsfoundation/lams/integration/security/Authenticator.java	(.../Authenticator.java)	(revision 66d8c0867b8f221842d7c09b755ee205bb121b33)
@@ -98,8 +98,9 @@
 	    int timeToLiveLoginRequest = map.getTimeToLiveLoginRequest();
 	    // sum up request time and maximum allowed request's time to live
 	    Date requestTimePlusTimeToLive = new Date(datetimeParam + timeToLiveLoginRequest * 60 * 1000);
+	    Date requestTimeMinusTimeToLive = new Date(datetimeParam - timeToLiveLoginRequest * 60 * 1000);
 	    Date now = new Date();
-	    if (requestTimePlusTimeToLive.before(now)) {
+	    if (requestTimePlusTimeToLive.before(now) || requestTimeMinusTimeToLive.after(now)) {
 		throw new AuthenticationException("Login Request can't be older than " + timeToLiveLoginRequest
 			+ " minutes. Please, refresh your previous page and try again.");
 	    }