Проблема с Rails 5 + MongoDB в производстве

Я только что переместил приложение Rails 5.2.2 на рабочий сервер, и у меня возникла проблема с MongoDB, ни один из запросов не работает. Вот некоторая информация:

CentOS 7
Ruby 2.6.3
Rails (5.2.2)
Mongoid (7.0.2)

$ mongo --version
MongoDB shell version v4.0.9
git version: fc525e2d9b0e4bceff5c2201457e564362909765
OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
allocator: tcmalloc
modules: none
build environment:
    distmod: rhel70
    distarch: x86_64
    target_arch: x86_64

Аутентификация MongoDB включена, пользователь с соответствующими правами создан, БД не пустая (была восстановлена ​​из локальной копии), вот рабочий раздел файла mongoid.yml:

production:
  clients:
    default:
      database: mydb_production
      hosts:
        - localhost:27017
      username: myuser
      password: "mypass"
      options:
        auth_mech: :scram
        auth_source: admin

Я продолжаю видеть эти topology сообщения об отладке в производственном журнале:

[rails_root]/журнал/production.log

D, [2019-05-27T20:01:58.272760 #27444] DEBUG -- : MONGODB | EVENT: #<TopologyOpening topology=Unknown[]>
D, [2019-05-27T20:01:58.272934 #27444] DEBUG -- : MONGODB | Topology type 'unknown' initializing.
D, [2019-05-27T20:01:58.273748 #27444] DEBUG -- : MONGODB | EVENT: #<TopologyChanged prev=Unknown[] new=Unknown[localhost:27017]>
D, [2019-05-27T20:01:58.273848 #27444] DEBUG -- : MONGODB | Topology type 'Unknown' changed to type 'Unknown'.
D, [2019-05-27T20:01:58.274028 #27444] DEBUG -- : MONGODB | EVENT: #<ServerOpening address=localhost:27017 topology=Unknown[localhost:27017]>
D, [2019-05-27T20:01:58.274091 #27444] DEBUG -- : MONGODB | Server localhost:27017 initializing.
D, [2019-05-27T20:01:58.365308 #27444] DEBUG -- : MONGODB | EVENT: #<ServerDescriptionChanged address=localhost:27017 topology=Single[localhost:27017] prev=#<Mongo::Server:Description:0x70049014837980 config = {} average_round_trip_time=> new=#<Mongo::Server:Description:0x70048970460940 config = {"ismaster"=>true, "maxBsonObjectSize"=>16777216, "maxMessageSizeBytes"=>48000000, "maxWriteBatchSize"=>100000, "localTime"=>2019-05-28 00:01:58 UTC, "logicalSessionTimeoutMinutes"=>30, "minWireVersion"=>0, "maxWireVersion"=>7, "readOnly"=>false, "ok"=>1.0} average_round_trip_time=0.088107942>>
D, [2019-05-27T20:01:58.365596 #27444] DEBUG -- : MONGODB | Server description for localhost:27017 changed from 'unknown' to 'standalone'.
D, [2019-05-27T20:01:58.365843 #27444] DEBUG -- : MONGODB | EVENT: #<TopologyChanged prev=Unknown[localhost:27017] new=Single[localhost:27017]>
D, [2019-05-27T20:01:58.366024 #27444] DEBUG -- : MONGODB | Topology type 'Unknown' changed to type 'Single'.

при подключении к консоли любая попытка чтения или записи записей выдает следующую ошибку:

$ rails c production
Running via Spring preloader in process 3131
Loading production environment (Rails 5.2.2)
2.6.3 :001 > User.first
Traceback (most recent call last):
        1: from (irb):1
NoMethodError (undefined method `encode' for nil:NilClass)

Есть идеи, что здесь происходит? Подключившись к базе данных либо с помощью графического интерфейса пользователя, либо через командную строку mongo, я могу нормально читать коллекции, поэтому я предполагаю, что это проблема между рельсами и монго, а не самим монго.

РЕДАКТИРОВАТЬ

Полная трассировка стека ошибки, мне кажется, что монгоид не может аутентифицироваться с MongoDB, хотя понятия не имею, почему, я использую те же конфигурации, что и при подключении через графический интерфейс или командную строку...

begin; User.first; rescue => e; puts e.backtrace.join("\n"); end
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/auth/user.rb:96:in `encoded_name'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/auth/scram/conversation.rb:334:in `first_bare'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/auth/scram/conversation.rb:277:in `client_first_message'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/auth/scram/conversation.rb:184:in `start'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/auth/scram.rb:71:in `login'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection.rb:284:in `block in authenticate!'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server.rb:361:in `handle_auth_failure!'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection.rb:282:in `authenticate!'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection.rb:135:in `connect!'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connectable.rb:78:in `ensure_connected'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection_base.rb:97:in `deliver'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection.rb:299:in `deliver'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection_base.rb:90:in `dispatch'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/operation/shared/executable.rb:42:in `block in dispatch_message'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server/connection_pool.rb:123:in `with_connection'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/server.rb:334:in `with_connection'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/operation/shared/executable.rb:41:in `dispatch_message'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/operation/shared/executable.rb:36:in `get_result'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/operation/shared/executable.rb:24:in `execute'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/operation/shared/executable_transaction_label.rb:27:in `execute'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/operation/shared/op_msg_or_find_command.rb:28:in `execute'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/collection/view/iterable.rb:82:in `send_initial_query'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/collection/view/iterable.rb:42:in `block in each'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/retryable.rb:43:in `read_with_retry'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongo-2.8.0/lib/mongo/collection/view/iterable.rb:40:in `each'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/query_cache.rb:227:in `each'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/contextual/mongo.rb:258:in `first'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/contextual/mongo.rb:258:in `block in first'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/contextual/mongo.rb:531:in `try_cache'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/contextual/mongo.rb:256:in `first'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/contextual.rb:20:in `first'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/mongoid-7.0.3/lib/mongoid/findable.rb:148:in `first'
(irb):1:in `irb_binding'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/workspace.rb:85:in `eval'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/workspace.rb:85:in `evaluate'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/context.rb:385:in `evaluate'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:493:in `block (2 levels) in eval_input'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:647:in `signal_status'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:490:in `block in eval_input'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/ruby-lex.rb:246:in `block (2 levels) in each_top_level_statement'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/ruby-lex.rb:232:in `loop'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/ruby-lex.rb:232:in `block in each_top_level_statement'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/ruby-lex.rb:231:in `catch'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb/ruby-lex.rb:231:in `each_top_level_statement'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:489:in `eval_input'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:428:in `block in run'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:427:in `catch'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:427:in `run'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/irb.rb:383:in `start'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/railties-5.2.2/lib/rails/commands/console/console_command.rb:64:in `start'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/railties-5.2.2/lib/rails/commands/console/console_command.rb:19:in `start'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/railties-5.2.2/lib/rails/commands/console/console_command.rb:96:in `perform'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/railties-5.2.2/lib/rails/command/base.rb:65:in `perform'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/railties-5.2.2/lib/rails/command.rb:46:in `invoke'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/railties-5.2.2/lib/rails/commands.rb:18:in `<main>'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:83:in `register'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
/var/www/webtsh/bin/rails:9:in `<main>'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:50:in `load'
/home/tsh/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:50:in `load'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/home/tsh/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'