diff --git a/telegram/utils/request.py b/telegram/utils/request.py
index 25f9a7e3a..5347f9c6b 100644
--- a/telegram/utils/request.py
+++ b/telegram/utils/request.py
@@ -94,6 +94,8 @@ def post(url,
     except HTTPError as error:
         if error.getcode() == 403:
             raise TelegramError('Unauthorized')
+        if error.getcode() == 502:
+            raise TelegramError('Bad Gateway')
 
         message = _parse(error.read())
         raise TelegramError(message)