You need to delete more than 1,000 Symantec Data Loss Prevention(DLP) Agents from the Enforce console at one time and are getting a red banner error.
DLP 15.x
DLP 16.x
Default setting is to limit DLP Endpoint Agent tasks to 1,000 or less.
Notes:
1. Increasing this setting above the default may cause performance issues in the Enforce console.
2. Initially while increasing the value, set it to 2,000 or 3,000 and test if it works as drastically increasing the value(ex. 120,000) may not work even though there is no upper limit.
3. By default, you can only select 200 agents at a time. If you would like to select more than 200 at a time, please modify the setting below in Manager.properties:
Look for this property:
# The max number of agents that can be displayed per page on the new agent list page.
# com.vontu.manager.agentlist.maxshowallagents = 200
4. Un-comment the second line and set it as needed, however do not increase it drastically as it will impact performance.
5. Save the changes and restart the Enforce server services.
For a similar issue related to disable, see: Red banner error when attempting to disable more than 1,000 DLP Endpoint agents at a time