Rails on FastCGI & oracle_adapter

We have developed project under RubyOnRails 2.0.2 with Oracle 10g Database (via "activerecord-oracle-adapter 1.0.0" installed from ruby gems).

But when I modify my .htaccess file to use FastCGI (RewriteRule ^(.*)$ dispatch.fcgi [QSA,L]) I see such error:

Error while trying to retrieve text for error ORA-12560

/usr/lib/ruby/site_ruby/1.8/oci8.rb:161:in `logon' /usr/lib/ruby/site_ruby/1.8/oci8.rb:161:in `initialize' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:616:in `new' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:616:in `new_connection' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:652:in `initialize' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:35:in `new' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:35:in `oracle_connection' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:291:in `send' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:291:in `connection=' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:259:in `retrieve_connection' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:78:in `connection' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ query_cache.rb:8:in `cache' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ caching.rb:677:in `perform_action' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ base.rb:524:in `send' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ base.rb:524:in `process_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ filters.rb:685:in `process_without_session_management_support' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ session_management.rb:123:in `process' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ base.rb:388:in `process' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:171:in `handle_request' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:115:in `dispatch' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:126:in `dispatch_cgi' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:9:in `dispatch' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:101:in `process_request' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:149:in `with_signal_handler' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:99:in `process_request' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:77:in `process_each_request' /usr/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:612:in `each_cgi' /usr/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:609:in `each' /usr/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:609:in `each_cgi' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:76:in `process_each_request' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:50:in `process!' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:24:in `process!' /sites/du/vs/dekanat.du/public/dispatch.fcgi:24

/usr/lib/ruby/site_ruby/1.8/oci8.rb:161:in `logon' /usr/lib/ruby/site_ruby/1.8/oci8.rb:161:in `initialize' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:616:in `new' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:616:in `new_connection' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:652:in `initialize' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:35:in `new' /usr/lib/ruby/gems/1.8/gems/activerecord-oracle-adapter-1.0.0/lib/ active_record/connection_adapters/oracle_adapter.rb:35:in `oracle_connection' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:291:in `send' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:291:in `connection=' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:259:in `retrieve_connection' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_adapters/abstract/connection_specification.rb:78:in `connection' /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ query_cache.rb:8:in `cache' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ caching.rb:677:in `perform_action' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ base.rb:524:in `send' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ base.rb:524:in `process_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ filters.rb:685:in `process_without_session_management_support' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ session_management.rb:123:in `process' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ base.rb:388:in `process' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:171:in `handle_request' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:115:in `dispatch' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:126:in `dispatch_cgi' /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ dispatcher.rb:9:in `dispatch' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:101:in `process_request' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:149:in `with_signal_handler' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:99:in `process_request' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:77:in `process_each_request' /usr/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:612:in `each_cgi' /usr/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:609:in `each' /usr/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:609:in `each_cgi' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:76:in `process_each_request' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:50:in `process!' /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/fcgi_handler.rb:24:in `process!' /sites/du/vs/dekanat.du/public/dispatch.fcgi:24

Why? Without FastCGI all is OK!