I think I know what causes this issue.
When adding push service provider, this App is misconfigured as dev version, with dev key and cert and sandbox is set to true.
This result in uniqush to push the message through
gateway.sandbox.push.apple.com. Maybe the sandbox server think key and cert for the App is illegal or something, so it refused to connect, then uniqush got an EOF for that connection. I guess that's why the subscription is unsubscribed.
After I deleted the misconfiguared psp and add psp with the right key, all is done.
Still thanks you for your attention to this issue.
nick2100於 2015年3月31日星期二 UTC+8下午2時24分54秒寫道: