出現類似 It seems the CA server is busy now 問題：

[Tue Sep 24 10:42:36 EEST 2019] Getting domain auth token for each domain

[Tue Sep 24 10:52:39 EEST 2019] It seems the CA server is busy now, let’s wait and retry. Sleeping 1 seconds.

[Tue Sep 24 11:02:45 EEST 2019] It seems the CA server is busy now, let’s wait and retry. Sleeping 1 seconds.

排(pai)查錯(cuo)誤（證書官方針對此問(wen)題(ti)說明）：

Today we have transitioned to a new CDN for the Production API. The change should already be visible worldwide. We expect that this change will not affect any client software.

We had previously made this transition for the Staging API: New CDN for the Staging API

With the new CDN, we have the opportunity to terminate TLS ourselves. The most visible change will be that the API will present a different TLS certificate. This will validate normally. We’ll also be able to make more agile ciphersuite changes in the future.

If you notice changes to API availability or behavior, please bring this to our attention here in the community forum. Thank you!

問(wen)題(ti)原因：Let’sEncrypt 證書(shu)(shu)已更新證書(shu)(shu)API接口，使用acme.sh生成證書(shu)(shu)的客戶，需升級到新版acme.sh來更正(zheng)此問(wen)題(ti)。

解決方法：

//github.com/Neilpang/acme.sh

cd /usr/local/acme.sh

acme.sh --upgrade

升級成功

更新域名證書：

acme.sh --renew -d 您的域名

更新完成！