There is an error occured when I tried
multiple time configure the nginx and then I was blocked from multiple authentication .
An unexpected error occurred: There were too many requests of a given type :: Error creating new order :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/
There is an answer: https://letsencrypt.org/docs/rate-limits/ . You have to wait for 1 hour to retry.Official statement:
There is a Failed Validation limit of 5 failures per account, per hostname, per hour. This limit is higher on our staging environment, so you can use that environment to debug connectivity problems.