Navision running on Server 2003 sp1 error 87

When I installed the Navision 3.60 on my new server running 2003 sp1, the client cant connect to the server. I started the server.exe in navision and get error 87 and click on the server .exe again and get error 487, then click on server.exe one last time and then it works. Why is this and how do I fix it?

all I know is that Error 87 - is usually due to an “Invalid Parameter” & Error 487 - is usually due to “ERROR_INVALID_ADDRESS”