What does a 503 error mean? Thaabit Mollagee March 09, 2016 08:47 Updated Follow This is a timeout error receive by merchants on 3D Secure when attempting to do a 3D Secure lookup. Related articles What does error code 1001 mean? What does error code “4030” mean? Where can I find a complete list of Wirecard response codes? What does validation failed mean? What does error 1001 mean? Comments 0 comments Please sign in to leave a comment.