Hi Patrick,
There are a number on "moving part" to check with ADCS.
1. NAS started and working (just check the event log for error/warnings)
2. Has Navision VT100 Plugin started successfully (again check the event log and you should have information logs)
3. Is the company name entered correctly
4. Are miniform tables populated ( copy over cronus for a start)
5. Have you warehouse employees setup
6. ADCS parameter set on NAS (as per installation quide)
7. Login form ticked on
8. Using the correct tcp/ip port number - check your regedit
9. Check that the TCP/IP port (normally 6666) is allowed in the firewall
Hope this helps