Errors occuring with Assets and Amazon S3 I've just set up a new S3 account and want to move my assets folders there. But when I try to upload a file, I get the following error:

S3::getObjectInfo(mikkelbang, shallowtree.png): [400] Unexpected HTTP status


And the same goes for when I try to update the Assets index:

S3::getBucket(): [InvalidRequest] The authorization mechanism you have provided is not supported.
Please use AWS4-HMAC-SHA256.


I've never used S3 before, so it might be something I need to set up there. But I couldn't find any documentation on setting up S3 with Craft...
There are a few regions that support only S3's v4 of signing requests without the possibility of falling back to v2.  The S3 library that Craft 2 uses only supports S3 v2. Check this table for reference - if it says "Version 4 only" in the last column then that region can't be used in Craft 2.

We're not switching out that library in Craft 2.x, but it won't be a problem in Craft 3, so currently your best bet is to move your bucket to a different region, which also supports S3 v2 signing of requests (any other one, really).