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Temporary failure in name resolution

Hello, I'm calling an API every minute using an AlwaysOnTask. The code worked for months, but since this morning around 5AM it stopped working (and I didn't change anything in my code). This is the trace:

2024-03-21 12:54:38 - Task preparing to start
Mar 21 12:55:06 Traceback (most recent call last):
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connection.py", line 169, in _new_conn
Mar 21 12:55:06     conn = connection.create_connection(
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/util/connection.py", line 73, in create_connection
Mar 21 12:55:06     for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
Mar 21 12:55:06   File "/usr/local/lib/python3.9/socket.py", line 953, in getaddrinfo
Mar 21 12:55:06     for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
Mar 21 12:55:06 socket.gaierror: [Errno -3] Temporary failure in name resolution
Mar 21 12:55:06 During handling of the above exception, another exception occurred:
Mar 21 12:55:06 Traceback (most recent call last):
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 699, in urlopen
Mar 21 12:55:06     httplib_response = self._make_request(
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 382, in _make_request
Mar 21 12:55:06     self._validate_conn(conn)
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 1010, in _validate_conn
Mar 21 12:55:06     conn.connect()
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connection.py", line 353, in connect
Mar 21 12:55:06     conn = self._new_conn()
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connection.py", line 181, in _new_conn
Mar 21 12:55:06     raise NewConnectionError(
Mar 21 12:55:06 urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPSConnection object at 0x7ff9e05fbca0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution
Mar 21 12:55:06 During handling of the above exception, another exception occurred:
Mar 21 12:55:06 Traceback (most recent call last):
Mar 21 12:55:06   File "/home/mattia90/.local/lib/python3.9/site-packages/requests/adapters.py", line 486, in send
Mar 21 12:55:06     resp = conn.urlopen(
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 755, in urlopen
Mar 21 12:55:06     retries = retries.increment(
Mar 21 12:55:06   File "/usr/local/lib/python3.9/site-packages/urllib3/util/retry.py", line 573, in increment
Mar 21 12:55:06     raise MaxRetryError(_pool, url, error or ResponseError(cause))
Mar 21 12:55:06 urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='data.trafficintelligence.ch', port=443): Max retries exceeded with url: /v1/Token (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7ff9e05fbca0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))
Mar 21 12:55:06 During handling of the above exception, another exception occurred:
Mar 21 12:55:06 Traceback (most recent call last):
Mar 21 12:55:06   File "/home/mattia90/mysite/update_traffic.py", line 33, in <module>
Mar 21 12:55:06     api = api_manager.Api_Manager()
Mar 21 12:55:06   File "/home/mattia90/mysite/api_manager.py", line 12, in __init__
Mar 21 12:55:06     self.generateToken()
Mar 21 12:55:06   File "/home/mattia90/mysite/api_manager.py", line 16, in generateToken
Mar 21 12:55:06     response = requests.post(self._API_TOKEN_URL, data=data)
Mar 21 12:55:06   File "/home/mattia90/.local/lib/python3.9/site-packages/requests/api.py", line 115, in post
Mar 21 12:55:06     return request("post", url, data=data, json=json, **kwargs)
Mar 21 12:55:06   File "/home/mattia90/.local/lib/python3.9/site-packages/requests/api.py", line 59, in request
Mar 21 12:55:06     return session.request(method=method, url=url, **kwargs)
Mar 21 12:55:06   File "/home/mattia90/.local/lib/python3.9/site-packages/requests/sessions.py", line 589, in request
Mar 21 12:55:06     resp = self.send(prep, **send_kwargs)
Mar 21 12:55:06   File "/home/mattia90/.local/lib/python3.9/site-packages/requests/sessions.py", line 703, in send
Mar 21 12:55:06     r = adapter.send(request, **kwargs)
Mar 21 12:55:06   File "/home/mattia90/.local/lib/python3.9/site-packages/requests/adapters.py", line 519, in send
Mar 21 12:55:06     raise ConnectionError(e, request=request)
Mar 21 12:55:06 requests.exceptions.ConnectionError: HTTPSConnectionPool(host='data.trafficintelligence.ch', port=443): Max retries exceeded with url: /v1/Token (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7ff9e05fbca0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))

If I call the API using the console, everything works as expected. It is failing only with the AlwaysOnTask apparently.

def generateToken(self):
    data = { "username": self._USER, "password": self._PASSWORD, "grant_type": "password" }
    response = requests.post(self._API_TOKEN_URL, data=data)
    if response.status_code == 200:
        self._last_token = json.loads(response.content)['access_token']
Beloved premium user mattia90 | 2 posts | March 21, 2024, 1:03 p.m. | permalink

Seems to be the same issue as https://eu.pythonanywhere.com/forums/topic/441/

Beloved premium user opensesame | 2 posts | March 21, 2024, 1:15 p.m. | permalink

We had some trouble with the network on the machines that run always on tasks. We have fixed it now and made some changes to make it less likely to recur in future.

Staff glenn | 279 posts | PythonAnywhere staff | March 21, 2024, 4 p.m. | permalink

Thanks!

Beloved premium user mattia90 | 2 posts | March 21, 2024, 4:39 p.m. | permalink