Amazon S3 backup: Giving up after 5 attempts. BackendException: No connection to backend

[Sander]

I seem to have a problem with the DejaDup backing up to my Amazon S3 storage. Everything was working before, but now it stopped working. I didn't change any settings in the meantime, but there has been an update of DejaDup from version 34.1-2 to 34.2-1 (I'm running Arch), after which this problem started occuring. The duplicity version on my system is 0.7.07-1.

This is the error I get from DejaDup:
Giving up after 5 attempts. BackendException: No connection to backend

I generated a log file, this might be more useful. I attached it to this bug report. Also I attached my DejaDup settings.

Thanks!

[Remis (plremis)]

I have the same issue after 34.2 upgrade.

I've checked in another workstation with the deja-dup 34.1 , same settings, same target storage, similar environment (Vanilla Gnome 3, Fedora 23 WorkStation), and everything is working fine.

On my workstation I get the same message:

`Giving up after 5 attempts. BackendException: No connection to backend`

When I try `deja-dup --backup` from the command line, on my workstation, I get this:

---

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1537, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1531, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1369, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/usr/lib64/python2.7/site-packages/duplicity/commandline.py", line 1109, in ProcessCommandLine
    globals.backend = backend.get_backend(args[0])
  File "/usr/lib64/python2.7/site-packages/duplicity/backend.py", line 223, in get_backend
    obj = get_backend_object(url_string)
  File "/usr/lib64/python2.7/site-packages/duplicity/backend.py", line 209, in get_backend_object
    return factory(pu)
  File "/usr/lib64/python2.7/site-packages/duplicity/backends/_boto_single.py", line 161, in __init__
    self.resetConnection()
  File "/usr/lib64/python2.7/site-packages/duplicity/backends/_boto_single.py", line 183, in resetConnection
    self.conn = get_connection(self.scheme, self.parsed_url, self.storage_uri)
  File "/usr/lib64/python2.7/site-packages/duplicity/backends/_boto_single.py", line 95, in get_connection
    conn = storage_uri.connect(is_secure=(not globals.s3_unencrypted_connection))
  File "/usr/lib/python2.7/site-packages/boto-2.39.0-py2.7.egg/boto/storage_uri.py", line 117, in connect
    **connection_args)
  File "/usr/lib/python2.7/site-packages/boto-2.39.0-py2.7.egg/boto/s3/connection.py", line 197, in __init__
    "When using SigV4, you must specify a 'host' parameter."
HostRequiredError: BotoClientError: When using SigV4, you must specify a 'host' parameter.

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[Moreno (ymoreno)]

Confirmed

[Michael Terry (mterry)]

This is not a bug in deja-dup, but seemingly python-boto (or maybe duplicity?). Does it work now with latest versions of those?