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The issue that caused the elevated rate of 415 errors has been resolved.

The truncated files were caused by a software issue that wrote some files with zero bytes. As it was software, this caused the truncated files to be replicated across all versions of the master file. Sirv triplicates every file to protect against hardware issues (server or hard drive failures), however, the updated files passed all checks and faithfully triplicated the files. It existed without detection because cach...

The issue was resolved at 1031 UTC.

The cause was a server misconfiguration which made the Sydney CDN location see all requests coming from the same IP address, instead of the true client IP address. This triggered DDOS protection, to rate-limit the excessive number of requests from the same IP. 429 responses were returned for many of the requests.

The issue appeared to have been an extremely short issue when the Sydney datacentre network became unavailable. That issue lasted approximat...