Microsoft's pyoxford vision OCR API is not working

first couple uploads went smooth before two days, start from yesterday this massage appear when I try to upload a picture

HTTPSConnectionPool(host='', port=443): Max retries exceeded with url: /vision/v1.0/ocr?language=en&detectOrientation=True (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 403 Forbidden',)))

Please could you help. Thanks.

Okay- we have added to the whitelist for you!

Thank you very much. It is working now.