How to restart FMS under unix

How do I restart FMS under unix? I tried

./fmsmgr server restart

but it returns

Server:restart command:
Server service restart not found. Exiting.

If i type ./fmsmgr server

it returns

Server:fms command:
NPTL 2.5
Usage: ./server {start|stop|restart}

so, the syntax is right, but it cannot find restart command. What am I missing here?

Thanks!