Connections timing out after 11.2.0.4 upgrade

We upgraded our database from 11.2.0.3 to 11.2.0.4 (Enterprise Edition for Linux 86 x64).  Now some long running connections are timing out and were not timing out before the upgrade.

I ran these commands:

SYS_SHRDWP01>SELECT PROFILE, LIMIT FROM DBA_PROFILES WHERE RESOURCE_NAME = 'IDLE_TIME';

PROFILE                        LIMIT
------------------------------ ----------------------------------------
DEFAULT                        UNLIMITED

SYS_SHRDWP01>select distinct profile from dba_users;

PROFILE
------------------------------
DEFAULT

the only other option I know to check is the sqlnet.ora file, but we do not use this file in our configuration.

Any help is greatly appreciated.