IPv6 only vCenter registration fails when IPv6 proxy is configured.

[rutuja-chaudhary]

We are trying to connect to a IPV6 only vcenter server from IPv6 only VM which has a IPv6 only proxy server configured on it.
below code snippet we are using to connect to the vCenter server.
Note: we are adding square brackets for ipv6 proxy server address.

if IPAddressUtils.is_valid_ipv6_address(self.proxy_server_info.get('address', None)):
            self.proxy_server_info['address']  = f"[{self.proxy_server_info.get('address', None)}]"
[self.si](http://self.si/) = SmartConnect(host=self.server_url,
                               user=self.username,
                               pwd=self.password,
                               sslContext=context,
                               httpProxyHost=self.proxy_server_info.get('address', None),
                               httpProxyPort=self.proxy_server_info.get('port', None),
                               customHeaders=self.proxy_server_info.get('proxy_headers', None))

We are seeing the below error with this configuration.

Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/etc/vcp/applianceRTVEnv/lib/python3.10/site-packages/vcp_common_utils/vcenter_service_manager.py", line 47, in connect
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     [self.si](http://self.si/) = SmartConnect(host=self.server_url,
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/etc/vcp/applianceRTVEnv/lib/python3.10/site-packages/pyVim/connect.py", line 974, in SmartConnect
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     supportedVersion = __FindSupportedVersion(protocol, host, port, path,
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/etc/vcp/applianceRTVEnv/lib/python3.10/site-packages/pyVim/connect.py", line 787, in __FindSupportedVersion
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     serviceVersionDescription = __GetServiceVersionDescription(
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/etc/vcp/applianceRTVEnv/lib/python3.10/site-packages/pyVim/connect.py", line 711, in __GetServiceVersionDescription
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     return __GetElementTree(protocol, server, port,
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/etc/vcp/applianceRTVEnv/lib/python3.10/site-packages/pyVim/connect.py", line 665, in __GetElementTree
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     conn.request(method="GET", url=path, headers=headers)
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 1285, in request
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     self._send_request(method, url, body, headers, encode_chunked)
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 1331, in _send_request
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     self.endheaders(body, encode_chunked=encode_chunked)
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 1280, in endheaders
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     self._send_output(message_body, encode_chunked=encode_chunked)
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 1040, in _send_output
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     self.send(msg)
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 978, in send
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     self.connect()
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 1450, in connect
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     super().connect()
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/http/client.py", line 944, in connect
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     self.sock = self._create_connection(
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/socket.py", line 828, in create_connection
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     for res in getaddrinfo(host, port, 0, SOCK_STREAM):
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:   File "/usr/lib/python3.10/socket.py", line 959, in getaddrinfo
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]:     for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
Oct 19 08:02:05 nvidia-gpu-manager bash[85427]: socket.gaierror: [Errno -2] Name or service not known

Is anything wrong or missing here?