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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...

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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).

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  • Haha. Figures I managed to pick the only region that doesn't work. Changed to another region and it works now. Thanks.
    – peirix
    Commented Dec 31, 2014 at 15:25
  • @andris-sevcenko more than a year later and I still run into this problem. When will Frankfurt be supported?
    – Florian
    Commented Mar 15, 2016 at 15:33
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    Note, that this is also a problem with the new Ohio region.
    – Trevor Davis
    Commented Nov 30, 2016 at 18:04
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    I can confirm this is also a problem with the London region. Ireland is okay.
    – Clive Portman
    Commented Mar 7, 2017 at 13:10
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    It would be helpful if this was mentioned in the Craft docs. Including some specific error logging (or validation when adding the assets config) would be even better still.
    – Dom Stubbs
    Commented Jul 19, 2017 at 15:27

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