When trying to log on to the database from a client when using a Cisco GSS and a CSM (Content Switch Module) the connection fails to complete or fails before receiving any data with a network related error:
ORA-12152: TNS:unable to send break message
Solution:
To resolve such an issue, make sure all switches or firewalls are set to the highest possible value and test. Once all connections are successful, the idle time limit can be tuned downward to a value that won't cause an interruption. This type of configuration would normally be handled by the Network Administrator of a system so this information should be passed on to them for actioning.
Ref:ORA-12152 "Unable To Send Break Message" on Connection [ID 363638.1]
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