--- transcluder/cookie_wrapper.py       (revision 6272)
+++ transcluder/cookie_wrapper.py       (working copy)
@@ -70,6 +70,10 @@
         cookie_dict['expires'] = str(int(time.time()) + int(cookie_dict['max-age']))
         del cookie_dict['max-age']

+        domain = cookie_dict.get('domain', '')
+    if ':' in domain:
+        cookie_dict['domain'] = domain[:domain.index(":")]
+
     return cookie_dict

 def get_set_cookies_from_headers(headers, url):