FAST Search for SharePoint 2010 Event ID 1000

Log Name: FAST Search Farm
Source: FAST Search Farm QRServer
Date: 16/12/2010 1:33:54 PM
Event ID: 1000
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: FST-01.DEV.LOCAL
Description:
FST-01: Admin error occurred during loading of keyword data. The keyword cache may be stale. Exception Message:Failed to communicate with the WCF service.

During one of our deployments of FAST Search (VMware virtual environment) we got the above error repeatedly on the FAST Search Node.

The resolution to this error was to create the local group FASTSearchKeywordAdministrators (It is not necessary to add any users at this time) on the FAST Search Node (FST-01 in our case) and stop and start the FAST Search service by running the following commands from the PS command prompt:

PS C:\FASTSearch\bin>nctrl stop

NOTE: Wait for 1 to 2 minutes for the FAST Search service to stop completely.

PS C:\FASTSearch\bin>nctrl start

The error in the FAST Search event logs should now be gone.