proxy error

[kumarvinod002]

I have configured TC in setting > shared configs on xl release
I have tested the connection as well
but while using a TC task in my release we are getting proxy error as below:
Exception during execution: requests.exceptions.ProxyError: HTTPSConnectionPool(host='teamcity.xyz.com', port=443): Max retries exceeded with url: //app/rest/buildQueue (Caused by ProxyError('Cannot connect to proxy.', NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x4>: Failed to establish a new connection: [Errno 10061] Connection refused',))) in <script> at line number 19
note that no proxy are defined in TC configs under settings > shared configs of XL release, there it is connecting without any proxies