I just tried updating my aurora install and it failed. I downloaded the same build and installed it to a new location with the same failure. I also tried using a new profile with the same result. Installer location http://archive.mozilla.org/pub/firefox/nightly/2015/12/2015-12-21-00-40-11-mozilla-aurora/firefox-45.0a2.en-US.win32.installer.exe Build info Vendor=Mozilla Name=Firefox RemotingName=firefox-dev CodeName=FirefoxDeveloperEdition Version=45.0a2 BuildID=20151221004011 SourceRepository=https://hg.mozilla.org/releases/mozilla-aurora SourceStamp=1ba4f6d91e637348dc0cdc7e9d311c4cddbc8a5e ID={ec8030f7-c20a-464f-9b0e-13a3a9e97384} Update URL https://aus5.mozilla.org/update/3/Firefox/45.0a2/20151221004011/WINNT_x86-msvc-x64/en-US/aurora/Windows_NT%2010.0.0.0%20(x64)/default/default/update.xml Update xml contents <updates> <update type="minor" displayVersion="45.0a2" appVersion="45.0a2" platformVersion="45.0a2" buildID="20151223004004"> <patch type="complete" URL="https://mozilla-nightly-updates.s3.amazonaws.com/mozilla-aurora/20151223004004/Firefox-mozilla-aurora-45.0a2-win32-en-US.complete.mar?versionId=bClRIqpjd689MgMrinNUP4T8k.99rRiz" hashFunction="sha512" hashValue="6fa83cc5f5bf05a878632ce92f9c34a618a1e3f0fb9671cef032bc820c7b3944ec047494035aede0668e03fe25db36028807996bd13322374b392ce8365f63c8" size="52198061"/> <patch type="partial" URL="https://mozilla-nightly-updates.s3.amazonaws.com/mozilla-aurora/20151223004004/Firefox-mozilla-aurora-45.0a2-win32-en-US-20151221004011-20151223004004.partial.mar?versionId=Xy8ZuPX7nKXdgQA.ouJoIGP9XGaL1jrL" hashFunction="sha512" hashValue="75525661e4ec15609a09de07b99e15cdee1c331de9e7ea91c0fd8ae3c4b4fa413f0e06190ca708e9e30240e45b6ca6ec8286cb1edd3fa46b09000b441b1f93fa" size="5811672"/> </update> </updates> When trying to download the mar I get the following <?xml version="1.0" encoding="UTF-8"?> <Error><Code>AccessDenied</Code><Message>Access Denied</Message><RequestId>A10C98889C45F0A1</RequestId><HostId>heof1sd0S3F81/YBvn1ne7f3M5oxejNl6CeDQ6prI8h3YcQsxLGQH2DSY9ntbjYdo3P0GnUi1Qs=</HostId></Error>

Rail, the SHA1 watershed is at 20151223004004, so rstrong's build is slightly older. But the oldest 'directory' in the bucket is mozilla-nightly-updates/mozilla-aurora/20160517004009/. The braindead solution is to modify the Firefox-mozilla-aurora-nightly-20151223004004 blob to remove partials, and point at the complete.mar on archive.mozilla.org. What do you think ? I bet this is a problem on central/nightly too, only for builds older than 20151209095500.

We expire MARs in that bucket after a month (IIRC). This is the reason why S3 returns AccessDenied. Canging the URLs to archive.m.o should help.

Sorry for the delay here. I've fixed up the releases Firefox-mozilla-aurora-nightly-20151223004004 and Firefox-mozilla-central-nightly-20151209095500.

Nick, did you intend to skip the SSE2 watershed?

It looks like we never had a SSE2 watershed on nightly or aurora, see bug 1271762 comment #18.