resty.auto-ssl.storage_adapters.redis

[ManuelFernando]

I'm trying to use the storage adapter for Redis but I can't get connect to an external Redis server which can be connected from the instance where is openresty using redis-cli but doesn't work, then I installed a Redis Server in the same machine without authentication but this does't still work.

This is code

  init_by_lua_block {
    auto_ssl = (require "resty.auto-ssl").new()
    auto_ssl:set("storage_adapter", "resty.auto-ssl.storage_adapters.redis")
    auto_ssl:set("redis", {socket = "unix:/var/run/redis/redis.sock"})
    auto_ssl:set("allow_domain", function(domain)
      return true
    end)
    auto_ssl:init()
  }

I get this error

auto-ssl: could not get certificate for sub.hostname.com - using fallback - failed to get or issue certificate, context: ssl_certificate_by_lua*