Stormpath Ruby SDK client initialization with custom caching options for Redis

client_setup.rb

api_key = Stormpath::ApiKey.new(ENV['test_api_key_id'], ENV['test_api_key_secret'])
client = Stormpath::Client.new(
           api_key: api_key,
           cache: {
             store: Stormpath::Cache::RedisStore,
             store_opts: {
               host: 'localhost',
               port: 7777
             },
             regions: {
               applications: {
                ttl_seconds: 120,
                tti_seconds: 60
               },
               directories: {
                ttl_seconds: 60,
                tti_seconds: 30
               },
               groups: {
                ttl_seconds: 90,
                tti_seconds: 45
               },
               accounts: {
                ttl_seconds: 0,
                tti_seconds: 0,
                store: Stormpath::Cache::DisabledCacheStore
               }
             }
           }
         )

client.directories.count # => 3
client.directories.search(name: 'Stormpath Administrators').first.accounts.first.email # => "[email protected]"

It seems to work fine with localhost, but as soon as I'm trying to set the host or url parameter to something which is not local, it does not work