diff --git a/src/aphront/configuration/AphrontApplicationConfiguration.php b/src/aphront/configuration/AphrontApplicationConfiguration.php
index 4e71a29c7b..8f353282ae 100644
--- a/src/aphront/configuration/AphrontApplicationConfiguration.php
+++ b/src/aphront/configuration/AphrontApplicationConfiguration.php
@@ -120,6 +120,7 @@ abstract class AphrontApplicationConfiguration {
     $file_uri     = PhabricatorEnv::getEnvConfig(
       'security.alternate-file-domain');
     $conduit_uris = PhabricatorEnv::getEnvConfig('conduit.servers');
+    $allowed_uris = PhabricatorEnv::getEnvConfig('phabricator.allowed-uris');
 
     $uris = array_merge(
       array(
@@ -127,7 +128,8 @@ abstract class AphrontApplicationConfiguration {
         $prod_uri,
         $file_uri,
       ),
-      $conduit_uris);
+      $conduit_uris,
+      $allowed_uris);
 
     $host_match = false;
     foreach ($uris as $uri) {
diff --git a/src/applications/config/option/PhabricatorCoreConfigOptions.php b/src/applications/config/option/PhabricatorCoreConfigOptions.php
index 053c5d1390..1d2e34167d 100644
--- a/src/applications/config/option/PhabricatorCoreConfigOptions.php
+++ b/src/applications/config/option/PhabricatorCoreConfigOptions.php
@@ -37,6 +37,19 @@ final class PhabricatorCoreConfigOptions
             "{{phabricator.base-uri}}. Most installs do not need to set ".
             "this option."))
         ->addExample('http://phabricator.example.com/', pht('Valid Setting')),
+      $this->newOption('phabricator.allowed-uris', 'list<string>', array())
+        ->setLocked(true)
+        ->setSummary(pht("Alternative URIs that can access Phabricator."))
+        ->setDescription(
+          pht(
+            "These alternative URIs will be able to access 'normal' pages ".
+              "on your Phabricator install. Other features such as OAuth ".
+              "won't work. The major use case for this is moving installs ".
+              "across domains."))
+        ->addExample(
+          '["http://phabricator2.example.com/", '.
+            '"http://phabricator3.example.com/]"',
+          pht('Valid Setting')),
       $this->newOption('phabricator.timezone', 'string', null)
         ->setSummary(
           pht("The timezone Phabricator should use."))
diff --git a/src/applications/differential/field/specification/DifferentialRevisionIDFieldSpecification.php b/src/applications/differential/field/specification/DifferentialRevisionIDFieldSpecification.php
index 3e341c25e9..2703386953 100644
--- a/src/applications/differential/field/specification/DifferentialRevisionIDFieldSpecification.php
+++ b/src/applications/differential/field/specification/DifferentialRevisionIDFieldSpecification.php
@@ -71,6 +71,14 @@ final class DifferentialRevisionIDFieldSpecification
       if ($uri == PhabricatorEnv::getProductionURI('/D'.$id)) {
         return $id;
       }
+
+      $allowed_uris = PhabricatorEnv::getAllowedURIs('/D'.$id);
+
+      foreach ($allowed_uris as $allowed_uri) {
+        if ($uri == $allowed_uri) {
+          return $id;
+        }
+      }
     }
 
     return null;
diff --git a/src/infrastructure/env/PhabricatorEnv.php b/src/infrastructure/env/PhabricatorEnv.php
index 1cad3d4f12..a9ed3571b0 100644
--- a/src/infrastructure/env/PhabricatorEnv.php
+++ b/src/infrastructure/env/PhabricatorEnv.php
@@ -278,6 +278,21 @@ final class PhabricatorEnv {
     return rtrim($production_domain, '/').$path;
   }
 
+  public static function getAllowedURIs($path) {
+    $uri = new PhutilURI($path);
+    if ($uri->getDomain()) {
+      return $path;
+    }
+
+    $allowed_uris = self::getEnvConfig('phabricator.allowed-uris');
+    $return = array();
+    foreach ($allowed_uris as $allowed_uri) {
+      $return[] = rtrim($allowed_uri, '/').$path;
+    }
+
+    return $return;
+  }
+
 
   /**
    * Get the fully-qualified production URI for a static resource path.