Let’s Encrypt证书Too many certificates already

Let's Encrypt证书是有次数限制的，一般为3次，多次申请就会提示Too many certificates already，所以在申请Let's Encrypt证书时请注意这一点：

Too many certificates already

Let's Encrypt证书重复申请次数太多就会提示报错，报错后需要1周时间才可以重复申请。