If you try to connect to MongoDB Replica Set via MognoID and you get this error message here:
/opt/local/lib/ruby1.9/gems/1.9.1/gems/mongo-1.5.2/lib/mongo/repl_set_connection.rb:165:inconnect': Failed to connect to primary node. (Mongo::ConnectionFailure) from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongo-1.5.2/lib/mongo/repl_set_connection.rb:500:insetup' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongo-1.5.2/lib/mongo/repl_set_connection.rb:144:ininitialize' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongoid-2.3.4/lib/mongoid/config/replset_database.rb:24:innew' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongoid-2.3.4/lib/mongoid/config/replset_database.rb:24:inconfigure' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongoid-2.3.4/lib/mongoid/config.rb:316:inconfigure_databases' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongoid-2.3.4/lib/mongoid/config.rb:119:infrom_hash' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongoid-2.3.4/lib/mongoid/config.rb:136:inload!' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/mongoid-2.3.4/lib/mongoid.rb:147:inload!' from /Users/reiz/workspace/versioneye/versioneye/config/application.rb:33:inclass:Application' from /Users/reiz/workspace/versioneye/versioneye/config/application.rb:18:in<module:Versioneye>' from /Users/reiz/workspace/versioneye/versioneye/config/application.rb:17:in' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:52:inrequire' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:52:inblock in ' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:49:intap' from /opt/local/lib/ruby1.9/gems/1.9.1/gems/railties-3.1.0/lib/rails/commands.rb:49:in' from script/rails inrequire' from script/rails:6:in'
Than you should check out this link here: https://github.com/mongoid/mongoid/issues/1783#issuecomment-4319677. Durran Jordan helped me to solve problem. Thx for that!
Robert Reiz 