NAV2009sp1 connection problem

Hi All,

I have Nav2009sp1 installed on server2008,normally when i try to connect at times it connects and at times it fails to connect.

i get this error

" A server not found qt “net.tcp//localhost:7046/DynamicsNAV/Service”.Either the URL is incorrect or the server is currently not available".

i have been restarting the server and then it connects or again fails.

How can i permanently solve this problem? such that it always connect.