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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 DA

## Services management

### Predefined services

This table lists the OPC DA services that have been predefined on the firewall. These services are classified by service set: Componet Categories, OPC Client, OPC Group, OPC Server and OPC Type Library.

Predefined OPC DA 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 DA services listed in the table.