As installed, the ATG default configuration enables event messaging for distributed TCP caching mode; you only need to ensure that the das_gsa_subscriber table is properly created in your database.

Event server

All SQL repositories in a given ATG instance set their eventServer property to the same event server component. The default component path is:


Event server ports

By default, each event server listens for cache invalidation events on a port that is randomly assigned by the operating system. Alternatively, you can set an event server component’s port property to a permanent port number—for example, in order to bypass a firewall.

Connection timeout

Occasionally, an event server cannot connect to another ATG instance immediately—for example, the host machine has gone down. The event server waits the time span specified by its connectTimeout property—by default, 60 seconds. The event server component specifies the timeout value in milliseconds. For example, the following setting specifies a two-minute timeout:


If a connection attempt times out, the event server prints a warning message; and the routing information for the item descriptor on the unresponsive ATG instance is removed from das_gsa_subscriber.

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