TLSV1_ALERT_PROTOCOL_VERSION with python requests package

Question

I am using the request package as

url = 'https://jobregister.aas.org'
page = requests.get(url) 

but this leads to the following error

requests.exceptions.ConnectionError: 
HTTPSConnectionPool(host=url, port=443): Max retries exceeded with url: / (Caused by SSLError(SSLError(1, u'[SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590)'),))

does anybody know what is causing this?

EDIT: I noticed that this error only happens with for the url above. Other urls don't show this issue?

Answer 1

I believe that your issue is that '/' does not want to establish communication with your Requests via TLS v1.0 .

I did encounter identical exception a couple days ago when I was using Python2.7.10 and OpenSSL 1.0.2l on my local machine. This issue was resolved by upgrading to Python2.7.13 . I haven't investigated in depth what is causation of Requests raising this exception yet.

Answer 2

In my case the server was configured with tls1.1 only. The solution was using SSLAdapter.

import requests, ssl
from requests_toolbelt import SSLAdapter

with requests.Session() as _sess:
    _sess.mount("https://", SSLAdapter(ssl.PROTOCOL_TLSv1_1))
    res = _sess.post(url_endpoint, **kwargs)