Proxy Authentication Issues

Recently I’ve been running into the following error when attempting to uploading to my plotly feed:

requests.exceptions.ProxyError: HTTPSConnectionPool(host='', port=443): Max retries exceeded with url: /clientresp (Caused by ProxyError('Cannot connect to proxy.', error(32, 'Broken pipe')))

I’m behind a corporate firewall, but I was able to upload yesterday. A quick nmap scan gives me the following:

$nmap -p 443 Starting Nmap 6.40 ( ) at 2016-05-05 17:07 BST Nmap scan report for ( Host is up (0.0097s latency). Other addresses for (not scanned): rDNS record for PORT STATE SERVICE 443/tcp closed https Nmap done: 1 IP address (1 host up) scanned in 0.12 seconds

I’ve went through the recommendations of setting my HTTP_PROXY and HTTPS_PROXY, with no success.

Has anyone come across this issue before? I’ve noticed that this happens when trying to upload larger amounts of data, but recently the data size is irrelevant.

I ran into this same issue, any updates?

Any one has any updates in this?