error code 20

I am recieving an error code 20 from Navision. It tells me that NetBios can not find the computer name. This only occurs when TCP/IP is installed. Works fine without TCP/IP. Using NT 4.0 SP 6a. and running a DHCP server from an ICS Win98 machine. Any one know what this might be?
  • Try to change the protocol numbers so netbios is the first protocol on the server, and make sure that netbios is default protocol on the clients.