diff --git a/packages/application-configuration/config.js b/packages/application-configuration/config.js
index 7268dc2ae8d..25c3c19a275 100644
--- a/packages/application-configuration/config.js
+++ b/packages/application-configuration/config.js
@@ -149,15 +149,50 @@ AppConfig.configurePackage = function (packageName, configure) {
   };
 };
 
-AppConfig.configureService = function (serviceName, configure) {
+AppConfig.configureService = function (serviceName, version, configure) {
+
+  // Collect all the endpoints for this service, from both old- and new-format
+  // documents, and call the `configure` callback with all the service endpoints
+  // that we know about.
+  var callConfigure = function (doc) {
+    var serviceDocs = Services.find({
+      name: serviceName,
+      version: version
+    });
+    var endpoints = [];
+    serviceDocs.forEach(function (serviceDoc) {
+      if (serviceDoc.providers) {
+        _.each(serviceDoc.providers, function (endpoint, app) {
+          endpoints.push(endpoint);
+        });
+      } else {
+        endpoints.push(serviceDoc.endpoint);
+      }
+    });
+    configure(endpoints);
+  };
+
   if (ultra) {
     // there's a Meteor.startup() that produces the various collections, make
     // sure it runs first before we continue.
     collectionFuture.wait();
-    ultra.subscribe('servicesByName', serviceName);
-    return Services.find({name: serviceName}).observe({
-      added: configure,
-      changed: configure
+    // First try to subscribe to the new format service registrations; if that
+    // sub doesn't exist, then ultraworld hasn't updated to the new format yet,
+    // so try the old format `servicesByName` sub instead.
+    ultra.subscribe('services', serviceName, version, {
+      onError: function (err) {
+        if (err.error === 404) {
+          ultra.subscribe('servicesByName', serviceName);
+        }
+      }
+    });
+    return Services.find({
+      name: serviceName,
+      version: version
+    }).observe({
+      added: callConfigure,
+      changed: callConfigure,
+      removed: callConfigure
     });
   }
 
diff --git a/packages/ctl-helper/ctl-helper.js b/packages/ctl-helper/ctl-helper.js
index 355583cb7e1..4806ddcc7a2 100644
--- a/packages/ctl-helper/ctl-helper.js
+++ b/packages/ctl-helper/ctl-helper.js
@@ -139,18 +139,20 @@ _.extend(Ctl, {
   updateProxyActiveTags: function (tags) {
     var proxy;
     var proxyTagSwitchFuture = new Future;
-    AppConfig.configureService('proxy', function (proxyService) {
-      try {
-        proxy = Follower.connect(proxyService.providers.proxy, {
-        group: "proxy"
-        });
-        proxy.call('updateTags', Ctl.myAppName(), tags);
-        proxy.disconnect();
-        if (!proxyTagSwitchFuture.isResolved())
-          proxyTagSwitchFuture['return']();
-      } catch (e) {
-        if (!proxyTagSwitchFuture.isResolved())
-          proxyTagSwitchFuture['throw'](e);
+    AppConfig.configureService('proxy', 'pre0', function (proxyService) {
+      if (proxyService && ! _.isEmpty(proxyService)) {
+        try {
+          proxy = Follower.connect(proxyService, {
+            group: "proxy"
+          });
+          proxy.call('updateTags', Ctl.myAppName(), tags);
+          proxy.disconnect();
+          if (!proxyTagSwitchFuture.isResolved())
+            proxyTagSwitchFuture['return']();
+        } catch (e) {
+          if (!proxyTagSwitchFuture.isResolved())
+            proxyTagSwitchFuture['throw'](e);
+        }
       }
     });
 
diff --git a/packages/webapp/webapp_server.js b/packages/webapp/webapp_server.js
index f647f967467..d8d6f282780 100644
--- a/packages/webapp/webapp_server.js
+++ b/packages/webapp/webapp_server.js
@@ -580,8 +580,9 @@ var runWebAppServer = function () {
           // on a per-job basis.  Discuss w/ teammates.
           proxyBinding = AppConfig.configureService(
             "proxy",
+            "pre0",
             function (proxyService) {
-              if (proxyService.providers.proxy) {
+              if (proxyService && ! _.isEmpty(proxyService)) {
                 var proxyConf;
                 // XXX Figure out a per-job way to specify bind location
                 // (besides hardcoding the location for ADMIN_APP jobs).
@@ -602,9 +603,9 @@ var runWebAppServer = function () {
                   proxyConf = configuration.proxy;
                 }
                 Log("Attempting to bind to proxy at " +
-                    proxyService.providers.proxy);
+                    proxyService);
                 WebAppInternals.bindToProxy(_.extend({
-                  proxyEndpoint: proxyService.providers.proxy
+                  proxyEndpoint: proxyService
                 }, proxyConf));
               }
             }