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IMPORTANT
SNS 3.x versions have reached End of Maintenance since July 1st, 2024.
We recommend that you update your SNS firewalls to a version with maintenance to guarantee the protection of your infrastructure.

# OPC AE

## Service management

### Predefined services

This table lists the OPC AE (OPC Alarms and Events) services that have been predefined on the firewall. These services are classified by service set: Component Categories, OPC Events and OPC Type Library.

Predefined OPC AE services are allowed by default (Analyze action). The buttons Block by service set, Analyze by service set and Modify all services allow modifying the action (Analyze / Block) applied to the selected service set or to all OPC AE services listed in the table.