Microsoft FAST Search Administration – Unexpected error occurred while communicating with Administration Service

http://gavinmckay.wordpress.com/2010/09/13/microsoft-fast-search-administration-unexpected-error-occurred-while-communicating-with-administration-service/

Installation of FAST Search Server fails on multi-core system

I've installed FAST Search for SharePoint 2010 on a new 32 core server after running Post Set Up Configuration Wizard I got an error.

finally, I've found this article.
http://support.microsoft.com/kb/2449600

FAST Search Server 2010 Configuration Wizard–“Database Validation Failed: Could not connect to the database. Check the database connection string, the database name and the port number to the database server”.

While your are running FAST Search Configuration Wizard. One thing may happen refer from this post.
http://jamesemann.wordpress.com/2011/07/20/fast-search-server-2010-configuration-wizarddatabase-validation-failed-could-not-connect-to-the-database-check-the-database-connection-string-the-database-name-and-the-port-number-to/

but enable user permission only dbcreator is enough.