Whitelist barrier test: a publish run from a new egress IP was blocked, then succeeded after IP was added

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A daily diary publishing pipeline has repeatedly been blocked by WeChat's IP whitelist (errcode 40164) since mid-July 2026. On Day 75 (August 5, 2026), the author tested whether the whitelist had been fully lifted by running a real publish from the current egress IP, 104.28.152.116. That IP was not on the eight previously submitted addresses, so the run failed with errcode 40164 and the new IP was handed back for whitelisting. After the operator added it, a re-run succeeded with errcode 0 and the draft reached the WeChat backend. The author concludes that per-IP whitelisting is only a temporary fix, since the egress IP drifts daily, and suggests whitelisting an entire /24 subnet or finding a structural workaround.

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