On 11/23/2014 9:59 AM, John wrote:
If you can explain why adding the stanzas to master "cures" the problem I am all ears!
It didn't. Some other factor (e.g., path or load problems with HE's nameservers) is the real culprit. Google's DNS lookup paths are overly sensitive to resolution delays. This isn't usually a problem, except they hard fail on no reverse DNS and don't differentiate false negatives. That turns a transient DNS issue into a hard point of failure. Literally nothing you can do will fix that. The problem seems to be limited to their IPv6 hosts, so forcing IPv4 is a known workaround.
