Hello All, This issue has been raised by so many people in this forum and in the web before. But i am not sure, whether all of those got fixed the issue. My application is running in 1)rails 2.2.2 2)ruby 1.8.6 (2008-08-11 patchlevel 287) [x86_64-linux] 3)MySQL 5.1.30-ndb-6.3.20-cluster-gpl MySQL Cluster Server (GPL) 4)Apache/2.2.3 + mongrel_cluster(1.0.5) The mongrel is hanged when it is idle for some time. I don''t get any errors in the logs. When i googled about this, i found the Mongrel FAQ page - http://mongrel.rubyforge.org/wiki/FAQ which says to set ActiveRecord::Base.verification_timeout = 14400. when i added this in environment.rb i got warning as below: DEPRECATION WARNING: ActiveRecord::Base.verification_timeout= has been deprecated and no longer has any effect. So the above solution failed. I tried so many trials like increasing MySQL interactive_timeout to a high value, updating the mysql gem etc... But no luck. After so many trials and search i found that this issue rises only in production mode. That is when config.cache_classes is set to true In my stage environment also i am having the same configuration as my production(rails, ruby, mysql, apache and mongrel_cluster). That is config.cache_classes is set to true. So, when config.cache_classes = true, the mongrel hangs up after a long idle time. When its is set to false, everything is O.K I doubt whether this(config.cache_classes = true) is the cause of the issue. I am not sure whether DB connections are also cached if config.cache_classes is set to true. Please help me in solving the issue. Any of your suggestions will be very helpful to me. Thanks in advance Murugaraj B -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=.