Got Secure Channel AdminUI setting to take effect.

src/main/java/org/nrg/xnat/configuration/SchedulerConfig.java

@@ -97,6 +97,7 @@ public class SchedulerConfig implements SchedulingConfigurer {
         _eventService.triggerEvent(new PreferenceEvent("emailPrefix", String.valueOf(XDAT.getNotificationsPreferences().getEmailPrefix())));
         _eventService.triggerEvent(new PreferenceEvent("host", String.valueOf(XDAT.getNotificationsPreferences().getHostname())));
         _eventService.triggerEvent(new PreferenceEvent("requireLogin", String.valueOf(XDAT.getSiteConfigPreferences().getRequireLogin())));
+        _eventService.triggerEvent(new PreferenceEvent("security.channel", String.valueOf(XDAT.getSiteConfigPreferences().getSecurityChannel())));
         for (final TriggerTask triggerTask : _triggerTasks) {
             taskRegistrar.addTriggerTask(triggerTask);
         }

src/main/java/org/nrg/xnat/event/listeners/methods/RequiredChannelHandlerMethod.java

+package org.nrg.xnat.event.listeners.methods;
+
+import com.google.common.collect.ImmutableList;
+import org.nrg.xdat.XDAT;
+import org.nrg.xnat.security.TranslatingChannelProcessingFilter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Component;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+@Component
+public class RequiredChannelHandlerMethod extends AbstractSiteConfigPreferenceHandlerMethod {
+    @Override
+    public List<String> getHandledPreferences() {
+        return PREFERENCES;
+    }
+
+    @Override
+    public void handlePreferences(final Map<String, String> values) {
+        if (!Collections.disjoint(PREFERENCES, values.keySet())) {
+            updateRequiredChannel();
+        }
+    }
+
+    @Override
+    public void handlePreference(final String preference, final String value) {
+        if(PREFERENCES.contains(preference)){
+            updateRequiredChannel();
+        }
+    }
+
+    private void updateRequiredChannel(){
+        _filter.setRequiredChannel(XDAT.getSiteConfigPreferences().getSecurityChannel());
+	}
+
+    private static final Logger       _log        = LoggerFactory.getLogger(RequiredChannelHandlerMethod.class);
+    private static final List<String> PREFERENCES = ImmutableList.copyOf(Arrays.asList("security.channel"));
+
+    @Autowired
+    @Lazy
+    private JdbcTemplate _template;
+
+    @Autowired
+    @Qualifier("channelProcessingFilter")
+    private TranslatingChannelProcessingFilter _filter;
+}

src/main/resources/META-INF/xnat/spawner/site-admin-elements.yaml

@@ -322,6 +322,7 @@ userLoginsSessionControls:
             name: UI.login_failure_message
             label: Login Failure Message
             description: Text to show when a user fails to login
+            value: "?? XNAT:data:siteConfig:UI.login_failure_message"
         maximumFailedLogins:
             kind: panel.input.number
             id: maximumFailedLogins