Failed to set ocsp stapling

Hello

We have domain with expired certificat that are not renew with this error in the log

``` 2019/02/15 12:07:32 [error] 18188#18188: *29843 [lua] ssl_certificate.lua:255: set_response_cert(): auto-ssl: failed to set ocsp stapling for insecticide-spray.com - continuing anyway - failed to get ocsp response: failed to validate OCSP response (http://ocsp.int-x3.letsencrypt.org): OCSP_check_validity() failed, context: ssl_certificate_by_lua*, client: 92.184.96.115, server: 0.0.0.0:443 ```

The only solution to force the renew is to delete the directory of this domain in the certs directory and to restart openresty.

Do you have a solution ?

Thank you

Start with the logged failure at ssl_certificate.lua:255 and inspect how the domain's certificate directory is handled during OCSP stapling and renewal. Reproduce the expired-certificate case using the reported error path and an OpenResty restart; done means renewal succeeds without manually deleting the domain directory.

Written by the indexing model from the issue text.