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!