diff --git a/app/config/errors.php b/app/config/errors.php
index 852b103dc5..741d66cbf8 100644
--- a/app/config/errors.php
+++ b/app/config/errors.php
@@ -554,6 +554,11 @@ return [
         'description' => 'Domain verification for the requested domain has failed.',
         'code' => 401,
     ],
+    Exception::DOMAIN_TARGET_INVALID => [
+        'name' => Exception::DOMAIN_TARGET_INVALID,
+        'description' => 'Your Appwrite instance is not publicly accessible. Please check the _APP_DOMAIN_TARGET environment variable of your Appwrite server.',
+        'code' => 501,
+    ],
     Exception::GRAPHQL_NO_QUERY => [
         'name' => Exception::GRAPHQL_NO_QUERY,
         'description' => 'Param "query" is not optional.',
diff --git a/app/controllers/api/projects.php b/app/controllers/api/projects.php
index b615b3555c..dd703be67b 100644
--- a/app/controllers/api/projects.php
+++ b/app/controllers/api/projects.php
@@ -1343,7 +1343,7 @@ App::post('/v1/projects/:projectId/domains')
         $target = new Domain(App::getEnv('_APP_DOMAIN_TARGET', ''));
 
         if (!$target->isKnown() || $target->isTest()) {
-            throw new Exception(Exception::GENERAL_SERVER_ERROR, 'Unreachable CNAME target (' . $target->get() . '), please use a domain with a public suffix.');
+            throw new Exception(Exception::DOMAIN_TARGET_INVALID, 'Unreachable CNAME target (' . $target->get() . '). Please check the _APP_DOMAIN_TARGET environment variable of your Appwrite server.');
         }
 
         $domain = new Domain($domain);
diff --git a/src/Appwrite/Extend/Exception.php b/src/Appwrite/Extend/Exception.php
index f072fcfad3..1bb09ed60d 100644
--- a/src/Appwrite/Extend/Exception.php
+++ b/src/Appwrite/Extend/Exception.php
@@ -178,6 +178,7 @@ class Exception extends \Exception
     public const DOMAIN_NOT_FOUND                  = 'domain_not_found';
     public const DOMAIN_ALREADY_EXISTS             = 'domain_already_exists';
     public const DOMAIN_VERIFICATION_FAILED        = 'domain_verification_failed';
+    public const DOMAIN_TARGET_INVALID             = 'domain_target_invalid';
 
     /** GraphqQL */
     public const GRAPHQL_NO_QUERY                  = 'graphql_no_query';