diff --git a/tcpclient.php b/tcpclient.php
index f66a80f..ef86827 100644
--- a/tcpclient.php
+++ b/tcpclient.php
@@ -74,7 +74,7 @@ class tcpclient
           $nsRecords = @dns_get_record ($ipOrName, DNS_CNAME);
           if ($nsRecords === false || $nsRecords == array ())
             throw new \Exception ("Can not find the IP for $ipOrName : ".
-              "DNS Error (No A, AAAA, CNAME entries)", 404);
+              "DNS Error (No A, AAAA, CNAME entries)", 523);
         }
         foreach ($nsRecords as $val)
         {
@@ -172,6 +172,15 @@ class tcpclient
       $this->socket = $socket;
       return $this->socket;
     }
+    if ($errno === 110)
+      throw new \Exception ("Can not connect to server $this->ipOrName : ".
+        "Connection timed out", 522);
+    if ($errno === 111)
+      throw new \Exception ("Can not connect to server $this->ipOrName : ".
+        "Connection refused", 521);
+    if ($errno === 113)
+      throw new \Exception ("Can not connect to server $this->ipOrName : ".
+        "No route to host", 523);
     throw new \Exception ("Can not connect to server $this->ipOrName : ".
       $errstr, 500);
   }