The user could not be added because the following error has occurred:
The trust relationship between this workstation and the primary domain failed.
If the computer is joined to the domain, DNS is properly configured, and you can communicate with a domain controller you do not have to add domain users as a local user. You just need to logon with the domain user account. At the logon screen pick Switch user. For the account name specify the domain user account in the following format: domain\user where domain is the NETBIOS name of the domain. You can add domain users to local groups (like Administators) but you can’t make a domain user a local user.
After logging into Windows 7 with the domain account, I did the following: –
1. Start Control Panel.
2. Select User Accounts icon.
3. The User Account window appears.
4. In the middle of the window, click Manage User Accounts.
5. The User Account Control window appears.
6. Provide the local administrator username and password.
7. Click Yes.
5. The User Accounts window appears.
6. Select Users tab.
7. Click Add button.
8. The Add New User window appears.
9. In User name text box, type the currently logged on user domain username.
10. In Domain text box, type the domain name.
11. Click Next
12. In What level of access do you want to grant this user pane, select a desired option, e.g. Administrator radio button.
13. Click Finish.
14. You are returned to User Accounts window and the currently logged on user is now listed in the Users for this computer list box as follows: –
UserName Domain Group
<username> <domain_name> Administrators