Landscape Client fails to recover from Could not resolve host

[Alan Baghumian]

It often happens that the Landscape client fails to recover from 'Could not resolve host' exceptions similar to the following:

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/landscape/client/broker/transport.py", line 81, in exchange
    curly, data = self._curl(spayload, computer_id, exchange_token,
  File "/usr/lib/python3/dist-packages/landscape/client/broker/transport.py", line 55, in _curl
    return (curl, fetch(self._url, post=True, data=payload,
  File "/usr/lib/python3/dist-packages/landscape/lib/fetch.py", line 118, in fetch
    raise PyCurlError(e.args[0], e.args[1])
landscape.lib.fetch.PyCurlError: Error 6: Could not resolve host: lds.int.hrizn.cloud
2023-10-13 15:13:36,295 INFO [MainThread] Message exchange failed.
2023-10-13 15:13:36,295 INFO [MainThread] Message exchange completed in 0.00s.
2023-10-13 15:14:36,354 INFO [MainThread] Starting urgent message exchange with https://lds.int.hrizn.cloud/message-system.
2023-10-13 15:14:36,358 ERROR [PoolThread-twisted.internet.reactor-1] Error contacting the server at https://lds.int.hrizn.cloud/message-system.
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/landscape/lib/fetch.py", line 116, in fetch
    curl.perform()
pycurl.error: (6, 'Could not resolve host: lds.int.hrizn.cloud')

The solution is to manually restart the service.

Affected version:

$ dpkg -l | grep landscape
ii landscape-client 23.02-0ubuntu1~22.04.1 amd64 Landscape administration system client
ii landscape-common 23.02-0ubuntu1~22.04.1 amd64 Landscape administration system client - Common files

Please let me know if you'd like me to provide additional logs or anything.

Thank you,
Alan