Manage the known servers table (KST)

The known servers table (KST) contains a list of Data Archive servers and AF servers used by client applications for connections. Previously, AF servers were stored in a file, while PI Data Archives were stored in the Windows registry. Starting with PI AF Client 2024, AF SDK applications now store the entire KST in local files instead of the registry.

During an upgrade, a migration tool automatically transfers registry-based KST entries to the new file-based KST. However, PI SDK applications still rely on the registry-based KST, so any new Data Archives added after the upgrade may need to be manually updated with multiple tools to ensure system-wide availability.

For more details on KST access methods, see KST access methods in PI Server products. For management and migration steps, see Overview of changes to the known servers table (KST) and Migrate KST using PI Server tools.