diff --git a/src/aphront/configuration/AphrontApplicationConfiguration.php b/src/aphront/configuration/AphrontApplicationConfiguration.php
--- a/src/aphront/configuration/AphrontApplicationConfiguration.php
+++ b/src/aphront/configuration/AphrontApplicationConfiguration.php
@@ -73,13 +73,26 @@
 
     $response = PhabricatorSetupCheck::willPreflightRequest();
     if ($response) {
-      PhabricatorStartup::endOutputCapture();
-      $sink->writeResponse($response);
-      return;
+      return self::writeResponse($sink, $response);
     }
 
     PhabricatorStartup::beginStartupPhase('env.init');
-    PhabricatorEnv::initializeWebEnvironment();
+
+    try {
+      PhabricatorEnv::initializeWebEnvironment();
+      $database_exception = null;
+    } catch (AphrontInvalidCredentialsQueryException $ex) {
+      $database_exception = $ex;
+    } catch (AphrontConnectionQueryException $ex) {
+      $database_exception = $ex;
+    }
+
+    if ($database_exception) {
+      $issue = PhabricatorSetupIssue::newDatabaseConnectionIssue(
+        $database_exception);
+      $response = PhabricatorSetupCheck::newIssueResponse($issue);
+      return self::writeResponse($sink, $response);
+    }
 
     $multimeter->setSampleRate(
       PhabricatorEnv::getEnvConfig('debug.sample-rate'));
@@ -111,9 +124,7 @@
 
     $response = PhabricatorSetupCheck::willProcessRequest();
     if ($response) {
-      PhabricatorStartup::endOutputCapture();
-      $sink->writeResponse($response);
-      return;
+      return self::writeResponse($sink, $response);
     }
 
     $host = AphrontRequest::getHTTPHeader('Host');
@@ -256,31 +267,7 @@
       $response = $controller->willSendResponse($response);
       $response->setRequest($request);
 
-      $unexpected_output = PhabricatorStartup::endOutputCapture();
-      if ($unexpected_output) {
-        $unexpected_output = pht(
-          "Unexpected output:\n\n%s",
-          $unexpected_output);
-
-        phlog($unexpected_output);
-
-        if ($response instanceof AphrontWebpageResponse) {
-          echo phutil_tag(
-            'div',
-            array(
-              'style' =>
-                'background: #eeddff;'.
-                'white-space: pre-wrap;'.
-                'z-index: 200000;'.
-                'position: relative;'.
-                'padding: 8px;'.
-                'font-family: monospace',
-            ),
-            $unexpected_output);
-        }
-      }
-
-      $sink->writeResponse($response);
+      self::writeResponse($sink, $response);
     } catch (Exception $ex) {
       if ($original_exception) {
         throw $original_exception;
@@ -291,6 +278,37 @@
     return $response;
   }
 
+  private static function writeResponse(
+    AphrontHTTPSink $sink,
+    AphrontResponse $response) {
+
+    $unexpected_output = PhabricatorStartup::endOutputCapture();
+    if ($unexpected_output) {
+      $unexpected_output = pht(
+        "Unexpected output:\n\n%s",
+        $unexpected_output);
+
+      phlog($unexpected_output);
+
+      if ($response instanceof AphrontWebpageResponse) {
+        echo phutil_tag(
+          'div',
+          array(
+            'style' =>
+              'background: #eeddff;'.
+              'white-space: pre-wrap;'.
+              'z-index: 200000;'.
+              'position: relative;'.
+              'padding: 8px;'.
+              'font-family: monospace',
+          ),
+          $unexpected_output);
+      }
+    }
+
+    $sink->writeResponse($response);
+  }
+
 
 /* -(  URI Routing  )-------------------------------------------------------- */
 
diff --git a/src/applications/config/check/PhabricatorDatabaseSetupCheck.php b/src/applications/config/check/PhabricatorDatabaseSetupCheck.php
--- a/src/applications/config/check/PhabricatorDatabaseSetupCheck.php
+++ b/src/applications/config/check/PhabricatorDatabaseSetupCheck.php
@@ -23,21 +23,17 @@
 
     try {
       queryfx($conn_raw, 'SELECT 1');
+      $database_exception = null;
+    } catch (AphrontInvalidCredentialsQueryException $ex) {
+      $database_exception = $ex;
     } catch (AphrontConnectionQueryException $ex) {
-      $message = pht(
-        "Unable to connect to MySQL!\n\n".
-        "%s\n\n".
-        "Make sure Phabricator and MySQL are correctly configured.",
-        $ex->getMessage());
+      $database_exception = $ex;
+    }
 
-      $this->newIssue('mysql.connect')
-        ->setName(pht('Can Not Connect to MySQL'))
-        ->setMessage($message)
-        ->setIsFatal(true)
-        ->addRelatedPhabricatorConfig('mysql.host')
-        ->addRelatedPhabricatorConfig('mysql.port')
-        ->addRelatedPhabricatorConfig('mysql.user')
-        ->addRelatedPhabricatorConfig('mysql.pass');
+    if ($database_exception) {
+      $issue = PhabricatorSetupIssue::newDatabaseConnectionIssue(
+        $database_exception);
+      $this->addIssue($issue);
       return;
     }
 
diff --git a/src/applications/config/check/PhabricatorSetupCheck.php b/src/applications/config/check/PhabricatorSetupCheck.php
--- a/src/applications/config/check/PhabricatorSetupCheck.php
+++ b/src/applications/config/check/PhabricatorSetupCheck.php
@@ -147,7 +147,7 @@
     return null;
   }
 
-  private static function newIssueResponse(PhabricatorSetupIssue $issue) {
+  public static function newIssueResponse(PhabricatorSetupIssue $issue) {
     $view = id(new PhabricatorSetupIssueView())
       ->setIssue($issue);
 
diff --git a/src/applications/config/issue/PhabricatorSetupIssue.php b/src/applications/config/issue/PhabricatorSetupIssue.php
--- a/src/applications/config/issue/PhabricatorSetupIssue.php
+++ b/src/applications/config/issue/PhabricatorSetupIssue.php
@@ -20,6 +20,26 @@
   private $originalPHPConfigValues = array();
   private $links;
 
+  public static function newDatabaseConnectionIssue(
+    AphrontQueryException $ex) {
+
+    $message = pht(
+      "Unable to connect to MySQL!\n\n".
+      "%s\n\n".
+      "Make sure Phabricator and MySQL are correctly configured.",
+      $ex->getMessage());
+
+    return id(new self())
+      ->setIssueKey('mysql.connect')
+      ->setName(pht('Can Not Connect to MySQL'))
+      ->setMessage($message)
+      ->setIsFatal(true)
+      ->addRelatedPhabricatorConfig('mysql.host')
+      ->addRelatedPhabricatorConfig('mysql.port')
+      ->addRelatedPhabricatorConfig('mysql.user')
+      ->addRelatedPhabricatorConfig('mysql.pass');
+  }
+
   public function addCommand($command) {
     $this->commands[] = $command;
     return $this;