Monitoring Scripting Client is available for download only to Sun customers who have any of these entitlements:
Sun GlassFish Enterprise Server
Sun GlassFish Enterprise Server Unlimited Offering
Sun GlassFish Enterprise Suite (Gold or Platinum Support levels only)
Sun GlassFish Enterprise Suite Unlimited Offering
Sun JavaTM Application Platform Suite
Sun Java Enterprise System
Sun Java Web Infrastructure Suite
Sun Web Space Server