PG::Error server closed the connection unexpectedly

Question

I am new to Ruby on rails. I've created two basic demo apps by tutorial learning by examples

and suddenly it stops working for my new sample app.

I have generated a controller Pages and two actions home and contact and nothing fancy.

Now, I am not able to open any pages, except the default index.html rails page at localhost:3000. The page at localhost:3000/pages/home and localhost:3000/pages/contact returns this error.

PG::Error

server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request.

and sometimes (usually when I restart postgresql),

PG::Error

server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. could not send startup packet: Broken pipe

This is my stack trace

activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:1213:in initialize' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:1213:in new' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:1213:in connect' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:329:in initialize' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:28:in new' activerecord (3.2.8) lib/active_record/connection_adapters/postgresql_adapter.rb:28:in postgresql_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:309:in new_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:319:in checkout_new_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:241:in block (2 levels) in checkout' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:236:in loop' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:236:in block in checkout' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in mon_synchronize' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:233:in checkout' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:96:in block in connection' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in mon_synchronize' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:95:in connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:404:in retrieve_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_specification.rb:170:in retrieve_connection' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_specification.rb:144:in connection' activerecord (3.2.8) lib/active_record/query_cache.rb:67:inrescue in call' activerecord (3.2.8) lib/active_record/query_cache.rb:61:in call' activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in call' actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:28:in block in call' activesupport (3.2.8) lib/active_support/callbacks.rb:405:in run_3261957284442330683_call_599627944998934036__callbacks' activesupport (3.2.8) lib/active_support/callbacks.rb:405:in __run_callback' activesupport (3.2.8) lib/active_support/callbacks.rb:385:in_run_call_callbacks' activesupport (3.2.8) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:27:incall' actionpack (3.2.8) lib/action_dispatch/middleware/reloader.rb:65:in call' actionpack (3.2.8) lib/action_dispatch/middleware/remote_ip.rb:31:in call' actionpack (3.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:16:in call' actionpack (3.2.8) lib/action_dispatch/middleware/show_exceptions.rb:56:incall' railties (3.2.8) lib/rails/rack/logger.rb:26:in call_app' railties (3.2.8) lib/rails/rack/logger.rb:16:incall' actionpack (3.2.8) lib/action_dispatch/middleware/request_id.rb:22:in call' rack (1.4.1) lib/rack/methodoverride.rb:21:incall' rack (1.4.1) lib/rack/runtime.rb:17:in call' activesupport (3.2.8) lib/active_support/cache/strategy/local_cache.rb:72:incall' rack (1.4.1) lib/rack/lock.rb:15:in call' actionpack (3.2.8) lib/action_dispatch/middleware/static.rb:62:incall' railties (3.2.8) lib/rails/engine.rb:479:in call' railties (3.2.8) lib/rails/application.rb:223:incall' rack (1.4.1) lib/rack/content_length.rb:14:in call' railties (3.2.8) lib/rails/rack/log_tailer.rb:17:incall' rack (1.4.1) lib/rack/handler/webrick.rb:59:in service' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in service' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in run' /home/jashwant/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in block in start_thread'

I am not using database for now. I tried to do rake db:migrate but it returns the same error.

I am on Ubuntu 12.04 (as some bugs on google were related to ubuntu)

I have found similar questions on SO, but they are experiencing at some advance stage and thus involves some advance solutions.

Solution

Although, I am not using the database but specifying the port in configuration in database.yml solves the problem. By default, the rails new <app_name> --database=postgresql command does not put a port there.

Here's my config.

development:
  adapter: postgresql
  encoding: unicode
  database: sample_app_development
  pool: 5  
  port: 5433
  username: myusername
  password: mypassword
  reconnect: true