diff --git a/index.js b/index.js
index e264866..5ec4433 100644
--- a/index.js
+++ b/index.js
@@ -436,7 +436,14 @@ Mod.prototype.callback = function (req, res, serverconsole, responseEnd, href, e
 
       handler = createFastCGIHandler(options);
       handler.on("error", function (error) {
-        var errorcode = (error.code == "ENOTFOUND" || error.code == "EHOSTUNREACH" || error.code == "ECONNREFUSED") ? 503 : 500;
+        var errorcode = 0;
+        if (error.code == "ENOTFOUND" || error.code == "EHOSTUNREACH" || error.code == "ECONNREFUSED") {
+          errorcode = 503;
+        } else if (error.code == "EMFILE") {
+          errorcode = 429;
+        } else {
+          errorcode = 500;
+        }
         if (!callServerError) {
           res.writeHead(errorcode, {
             "Content-Type": "text/html",