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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 HDA

## Service management

### Predefined services

This table lists the OPC HDA (OPC Historical Data Access) services that have been predefined on the firewall. These services are classified by service set: Component Categories, OPC Browser, OPC Client, OPC Server and OPC Type Library.

Predefined OPC HDA 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 HDA services listed in the table.