Context: The cache nodes run a periodic script to fetch updated carriers/proxies JSON data from Zerowiki. The fetch is authenticated and works correctly at all of the existing datacenters, but authentication fails with Exception: API login phase2 gave result Failed, expected "Success" from the new eqsin (Singapore) cache nodes.
My best suspicion would be that there's an IP-address whitelist configured somewhere (in a repo? on-wiki?) for allowing this account to login to Zerowiki for the fetching, and the whitelist is missing the new private eqsin network ranges.