SSL validation failed for https://email.eu-west-1.amazonaws.com/

I am sending daily about 20 000 mails to Amazon SES, using boto3 client. Since a week, almost every day I got same exceptions about SSL verification. Daily it is about 3-5 errors for all my mails.

Today’s bug hours: 01:36 UTC
03:30 UTC 04:18 UTC Every day these exceptions are around this time

It was working fine for like a year, but since a week there are problems.

My AWS Config - just secret key, access key and region (eu-west-1). I added 2 days ago parameter verify=False but it did nothing.

I am sending mails by client.send_email() function.

Steps to reproduce I don’t think there is a way, it comes randomly 3-5 times for a day

Expected behavior No exception

Debug logs Don’t have boto3 logs, but here is my exception

Traceback (most recent call last):
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 672, in urlopen
    chunked=chunked,
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 376, in _make_request
    self._validate_conn(conn)
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 994, in _validate_conn
    conn.connect()
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connection.py", line 360, in connect
    ssl_context=context,
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/util/ssl_.py", line 370, in ssl_wrap_socket
    return context.wrap_socket(sock, server_hostname=server_hostname)
  File "/usr/lib/python3.6/ssl.py", line 407, in wrap_socket
    _context=self, _session=session)
  File "/usr/lib/python3.6/ssl.py", line 817, in __init__
    self.do_handshake()
  File "/usr/lib/python3.6/ssl.py", line 1077, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/lib/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:852)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/httpsession.py", line 263, in send
    chunked=self._chunked(request.headers),
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 720, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/util/retry.py", line 376, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/packages/six.py", line 734, in reraise
    raise value.with_traceback(tb)
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 672, in urlopen
    chunked=chunked,
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 376, in _make_request
    self._validate_conn(conn)
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 994, in _validate_conn
    conn.connect()
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/connection.py", line 360, in connect
    ssl_context=context,
  File "/home/mailsender/venv/lib/python3.6/site-packages/urllib3/util/ssl_.py", line 370, in ssl_wrap_socket
    return context.wrap_socket(sock, server_hostname=server_hostname)
  File "/usr/lib/python3.6/ssl.py", line 407, in wrap_socket
    _context=self, _session=session)
  File "/usr/lib/python3.6/ssl.py", line 817, in __init__
    self.do_handshake()
  File "/usr/lib/python3.6/ssl.py", line 1077, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/lib/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
urllib3.exceptions.SSLError: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:852)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mailsender/mailsender/production/aws_functions.py", line 43, in send_to_aws
    Source=source
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/client.py", line 316, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/client.py", line 613, in _make_api_call
    operation_model, request_dict, request_context)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/client.py", line 632, in _make_request
    return self._endpoint.make_request(operation_model, request_dict)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/endpoint.py", line 102, in make_request
    return self._send_request(request_dict, operation_model)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/endpoint.py", line 137, in _send_request
    success_response, exception):
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/endpoint.py", line 231, in _needs_retry
    caught_exception=caught_exception, request_dict=request_dict)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/hooks.py", line 356, in emit
    return self._emitter.emit(aliased_event_name, **kwargs)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/hooks.py", line 228, in emit
    return self._emit(event_name, kwargs)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/hooks.py", line 211, in _emit
    response = handler(**kwargs)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/retryhandler.py", line 183, in __call__
    if self._checker(attempts, response, caught_exception):
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/retryhandler.py", line 251, in __call__
    caught_exception)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/retryhandler.py", line 277, in _should_retry
    return self._checker(attempt_number, response, caught_exception)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/retryhandler.py", line 317, in __call__
    caught_exception)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/retryhandler.py", line 223, in __call__
    attempt_number, caught_exception)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/retryhandler.py", line 359, in _check_caught_exception
    raise caught_exception
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/endpoint.py", line 200, in _do_get_response
    http_response = self._send(request)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/endpoint.py", line 244, in _send
    return self.http_session.send(request)
  File "/home/mailsender/venv/lib/python3.6/site-packages/botocore/httpsession.py", line 281, in send
    raise SSLError(endpoint_url=request.url, error=e)
botocore.exceptions.SSLError: SSL validation failed for https://email.eu-west-1.amazonaws.com/ [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:852)

[a-was]

Actually, the problem has recently disappeared on its own, without any (!) change on my part. As I thought, the problem was created and fixed by Amazon. I’m only afraid what if it will be a thing again…

[swetashre]

I am glad you got it working. But we would need some more information like the one i asked in my last response to figure out if its an issue on the client side. If the issue comes again then please reopen the issue, i would be glad to help.

I am closing this issue as this has been resolved.