hi,
Are you using Cronus Demo licence ?
Are you using sql server with mixed mode authenticathion?
error 18456 is remote access error for sql logins
Check on error message
anonymous Logins,
firewall& sql ports problems ex: sql port 1433, etc.
surface area configuration
Try to use NETWORK SERVICE user for SQL Server & NAV Services, map this user & SYSTEM user into NAV users
Try to delete all user on database and all NAV user personalization & metadata
(see NAV Team blog post Manually restoring the NAV 2013 Demo Database)
Connection testing environment
Try to connect using Default instead of TCP
Try to connect with Sql "SA" supeuser
add user on database Logins (if dbo user is missing)
try to remap credentials on NAVdemo db to SA dbo from SQL Management Studio
To test
- make a backup of Cronus ,bck using windows user
- create a NEW Db using SA sql user and after load Cronus licence into this db
- restore Cronus Backup .fdb into the nw db
- try to open from developer enviroment with SA