Comment 2 for bug 664281

That's the infamous "libsoup status code 3" bug, which I haven't yet been able to reproduce or associate with a specific cause. Can you post on the linked bug (https://bugs.launchpad.net/pithos/+bug/602727) whether or not you're configuring a proxy in (1) Pithos, (2) System -> Network Proxy, and (3) anywhere else, e.g. environment variables. Hopefully I can figure out what's going on here.