HTTPConnectionPool

运行的时候会报这个错，请问怎么解决
`
Error in Pgpsearch.pyc: HTTPConnectionPool(host='pgp.mit.edu', port=80): Max retries exceeded with url: /pks/lookup?search=s.com&op=index (Caused by ReadTimeoutError("HTTPConnectionPool(host='pgp.mit.edu', port=80): Read timed out. (read timeout=25)",))
`