diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -789,6 +789,7 @@
     'DiffusionRepositorySymbolsManagementPanel' => 'applications/diffusion/management/DiffusionRepositorySymbolsManagementPanel.php',
     'DiffusionRepositoryTag' => 'applications/diffusion/data/DiffusionRepositoryTag.php',
     'DiffusionRepositoryTestAutomationController' => 'applications/diffusion/controller/DiffusionRepositoryTestAutomationController.php',
+    'DiffusionRepositoryURIDisableController' => 'applications/diffusion/controller/DiffusionRepositoryURIDisableController.php',
     'DiffusionRepositoryURIEditController' => 'applications/diffusion/controller/DiffusionRepositoryURIEditController.php',
     'DiffusionRepositoryURIViewController' => 'applications/diffusion/controller/DiffusionRepositoryURIViewController.php',
     'DiffusionRepositoryURIsIndexEngineExtension' => 'applications/diffusion/engineextension/DiffusionRepositoryURIsIndexEngineExtension.php',
@@ -5019,7 +5020,8 @@
     'DiffusionRepositorySymbolsManagementPanel' => 'DiffusionRepositoryManagementPanel',
     'DiffusionRepositoryTag' => 'Phobject',
     'DiffusionRepositoryTestAutomationController' => 'DiffusionRepositoryEditController',
-    'DiffusionRepositoryURIEditController' => 'DiffusionRepositoryEditController',
+    'DiffusionRepositoryURIDisableController' => 'DiffusionController',
+    'DiffusionRepositoryURIEditController' => 'DiffusionController',
     'DiffusionRepositoryURIViewController' => 'DiffusionController',
     'DiffusionRepositoryURIsIndexEngineExtension' => 'PhabricatorIndexEngineExtension',
     'DiffusionRepositoryURIsManagementPanel' => 'DiffusionRepositoryManagementPanel',
diff --git a/src/applications/diffusion/application/PhabricatorDiffusionApplication.php b/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
--- a/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
+++ b/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
@@ -93,6 +93,8 @@
             => 'DiffusionRepositoryManageController',
           'uri/' => array(
             'view/(?P<id>[0-9]\d*)/' => 'DiffusionRepositoryURIViewController',
+            'disable/(?P<id>[0-9]\d*)/'
+              => 'DiffusionRepositoryURIDisableController',
             $this->getEditRoutePattern('edit/')
               => 'DiffusionRepositoryURIEditController',
           ),
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryURIDisableController.php b/src/applications/diffusion/controller/DiffusionRepositoryURIDisableController.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/controller/DiffusionRepositoryURIDisableController.php
@@ -0,0 +1,72 @@
+<?php
+
+final class DiffusionRepositoryURIDisableController
+  extends DiffusionController {
+
+  public function handleRequest(AphrontRequest $request) {
+    $response = $this->loadDiffusionContextForEdit();
+    if ($response) {
+      return $response;
+    }
+
+    $viewer = $this->getViewer();
+    $drequest = $this->getDiffusionRequest();
+    $repository = $drequest->getRepository();
+
+    $id = $request->getURIData('id');
+    $uri = id(new PhabricatorRepositoryURIQuery())
+      ->setViewer($viewer)
+      ->withIDs(array($id))
+      ->withRepositories(array($repository))
+      ->requireCapabilities(
+        array(
+          PhabricatorPolicyCapability::CAN_VIEW,
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+      ->executeOne();
+    if (!$uri) {
+      return new Aphront404Response();
+    }
+
+    $is_disabled = $uri->getIsDisabled();
+    $view_uri = $uri->getViewURI();
+
+    if ($request->isFormPost()) {
+      $xactions = array();
+
+      $xactions[] = id(new PhabricatorRepositoryURITransaction())
+        ->setTransactionType(PhabricatorRepositoryURITransaction::TYPE_DISABLE)
+        ->setNewValue(!$is_disabled);
+
+      $editor = id(new DiffusionURIEditor())
+        ->setActor($viewer)
+        ->setContinueOnNoEffect(true)
+        ->setContinueOnMissingFields(true)
+        ->setContentSourceFromRequest($request)
+        ->applyTransactions($uri, $xactions);
+
+      return id(new AphrontRedirectResponse())->setURI($view_uri);
+    }
+
+    if ($is_disabled) {
+      $title = pht('Enable URI');
+      $body = pht(
+        'Enable this URI? Any configured behaviors will begin working '.
+        'again.');
+      $button = pht('Enable URI');
+    } else {
+      $title = pht('Disable URI');
+      $body = pht(
+        'Disable this URI? It will no longer be observed, fetched, mirrored, '.
+        'served or shown to users.');
+      $button = pht('Disable URI');
+    }
+
+    return $this->newDialog()
+      ->setTitle($title)
+      ->appendParagraph($body)
+      ->addCancelButton($view_uri)
+      ->addSubmitButton($button);
+  }
+
+}
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryURIEditController.php b/src/applications/diffusion/controller/DiffusionRepositoryURIEditController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryURIEditController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryURIEditController.php
@@ -1,7 +1,7 @@
 <?php
 
 final class DiffusionRepositoryURIEditController
-  extends DiffusionRepositoryEditController {
+  extends DiffusionController {
 
   public function handleRequest(AphrontRequest $request) {
     $response = $this->loadDiffusionContextForEdit();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryURIViewController.php b/src/applications/diffusion/controller/DiffusionRepositoryURIViewController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryURIViewController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryURIViewController.php
@@ -82,16 +82,18 @@
 
   private function buildCurtain(PhabricatorRepositoryURI $uri) {
     $viewer = $this->getViewer();
+    $id = $uri->getID();
 
     $can_edit = PhabricatorPolicyFilter::hasCapability(
       $viewer,
       $uri,
       PhabricatorPolicyCapability::CAN_EDIT);
 
-    $edit_uri = $uri->getEditURI();
 
     $curtain = $this->newCurtainView($uri);
 
+    $edit_uri = $uri->getEditURI();
+
     $curtain->addAction(
       id(new PhabricatorActionView())
         ->setIcon('fa-pencil')
@@ -100,6 +102,24 @@
         ->setWorkflow(!$can_edit)
         ->setDisabled(!$can_edit));
 
+    if ($uri->getIsDisabled()) {
+      $disable_name = pht('Enable URI');
+      $disable_icon = 'fa-check';
+    } else {
+      $disable_name = pht('Disable URI');
+      $disable_icon = 'fa-ban';
+    }
+
+    $disable_uri = $uri->getRepository()->getPathURI("uri/disable/{$id}/");
+
+    $curtain->addAction(
+      id(new PhabricatorActionView())
+        ->setIcon($disable_icon)
+        ->setName($disable_name)
+        ->setHref($disable_uri)
+        ->setWorkflow(true)
+        ->setDisabled(!$can_edit));
+
     return $curtain;
   }
 
diff --git a/src/applications/diffusion/editor/DiffusionURIEditor.php b/src/applications/diffusion/editor/DiffusionURIEditor.php
--- a/src/applications/diffusion/editor/DiffusionURIEditor.php
+++ b/src/applications/diffusion/editor/DiffusionURIEditor.php
@@ -217,6 +217,25 @@
           $errors[] = $error;
           break;
         }
+
+        foreach ($xactions as $xaction) {
+          $new_uri = $xaction->getNewValue();
+          if ($new_uri == $object->getURI()) {
+            continue;
+          }
+
+          try {
+            PhabricatorRepository::assertValidRemoteURI($new_uri);
+          } catch (Exception $ex) {
+            $errors[] = new PhabricatorApplicationTransactionValidationError(
+              $type,
+              pht('Invalid'),
+              $ex->getMessage(),
+              $xaction);
+            continue;
+          }
+        }
+
         break;
       case PhabricatorRepositoryURITransaction::TYPE_IO:
         $available = $object->getAvailableIOTypeOptions();
diff --git a/src/applications/diffusion/management/DiffusionRepositoryURIsManagementPanel.php b/src/applications/diffusion/management/DiffusionRepositoryURIsManagementPanel.php
--- a/src/applications/diffusion/management/DiffusionRepositoryURIsManagementPanel.php
+++ b/src/applications/diffusion/management/DiffusionRepositoryURIsManagementPanel.php
@@ -91,13 +91,19 @@
           null,
         ));
 
-    $doc_href = PhabricatorEnv::getDoclink(
-      'Diffusion User Guide: URIs');
+    $doc_href = PhabricatorEnv::getDoclink('Diffusion User Guide: URIs');
+    $add_href = $repository->getPathURI('uri/edit/');
 
     $header = id(new PHUIHeaderView())
       ->setHeader(pht('Repository URIs'))
       ->addActionLink(
         id(new PHUIButtonView())
+          ->setIcon('fa-plus')
+          ->setHref($add_href)
+          ->setTag('a')
+          ->setText(pht('Add New URI')))
+      ->addActionLink(
+        id(new PHUIButtonView())
           ->setIcon('fa-book')
           ->setHref($doc_href)
           ->setTag('a')
diff --git a/src/applications/repository/storage/PhabricatorRepository.php b/src/applications/repository/storage/PhabricatorRepository.php
--- a/src/applications/repository/storage/PhabricatorRepository.php
+++ b/src/applications/repository/storage/PhabricatorRepository.php
@@ -1829,8 +1829,8 @@
 
         throw new Exception(
           pht(
-            "The URI protocol is unrecognized. It should begin ".
-            "'%s', '%s', '%s', '%s', '%s', '%s', or be in the form '%s'.",
+            'The URI protocol is unrecognized. It should begin with '.
+            '"%s", "%s", "%s", "%s", "%s", "%s", or be in the form "%s".',
             'ssh://',
             'http://',
             'https://',
diff --git a/src/applications/repository/storage/PhabricatorRepositoryURITransaction.php b/src/applications/repository/storage/PhabricatorRepositoryURITransaction.php
--- a/src/applications/repository/storage/PhabricatorRepositoryURITransaction.php
+++ b/src/applications/repository/storage/PhabricatorRepositoryURITransaction.php
@@ -51,6 +51,16 @@
           $this->renderHandleLink($author_phid),
           $old_label,
           $new_label);
+      case self::TYPE_DISABLE:
+        if ($new) {
+          return pht(
+            '%s disabled this URI.',
+            $this->renderHandleLink($author_phid));
+        } else {
+          return pht(
+            '%s enabled this URI.',
+            $this->renderHandleLink($author_phid));
+        }
 
     }