nginx failing to resolve upstream names on reload even if they DO resolve by the OS

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http://serverfault.com – When reloading config (specifically for proxy_pass) - occasionally this will be seen: nginx: [emerg] host not found in upstream However - the upstream server's name WILL resolve in the os (linux) - only nginx seems to have this problem. This seems to be a recent regression - as it didn't seem to happen previous to 1.0.10 versions. Has anyone noticed this recently? Trying to narrow down places to search. (HowTos)