DBCP and Firewall timeouts

Hello,

 We have a tomcat 5.5 server and a mysql 5.1 database sitting between
a firewall. The firewall times out connections after 60 minutes.  We
tried setting the minEvictableIdleTimeMillis to be 30 minutes but we
are still seeing these timeouts.

 Is there a recommended config of ensuring the connection pool
connections either get cleanly terminated or are sanity checked for
proper connectivity?  We are using JRuby/Tomcat/Rails and are seeing a
lot of timeouts after inactivity in the app.

Thanks
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