If you have fresh install Window 7 and using NComputing , and you have not set passwords for client users, you would get following error while login on client machine
Logon failure: user account restriction. Possible reasons are blank passwords not allowed, logon hour restrictions, or a policy restriction has been enforced.
by default, user accounts with empty passwords cannot access network resources. Please verify no logon restrictions exist in Active Directory/Group Policy.
Setting the password may solve this problem , but every time you need to login , you have to provide the password. sometime it is not convenient
for small children to remember password , so we need to remove this password. Following are the steps to use empty password .
for small children to remember password , so we need to remove this password. Following are the steps to use empty password .
1. Click on start button and run command (Window button + r)
2. run box would appear. type the command gpedit.msc and click on ok button. the following screen Local Group Policy Editor would appear.
3. At the left pane, go to Local Computer Policy > Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options
4. Look for “Accounts: Limit local account use of blank passwords to console logon only” and double click on it. in right pane.

5. A dialogue box would appear. By default the Enable option is selected and all you need to do is select “Disable” and click on Apply and OK.
Now you can connect to the computer or Ncomputing clients using Remote Desktop and login to the user account that don’t have a password.
if you are facing this king of error message :
To log on to this remote computer, you must be granted the Allow log on through Terminal Services right. By default, members of the Remote Desktop Users group have this right. If you are not a member of the Remote Desktop Users group or another group that has this right, or if the Remote Desktop Users group does not have this right, you must be granted this right manually.
To log on to this remote computer, you must be granted the Allow log on through Terminal Services right. By default, members of the Remote Desktop Users group have this right. If you are not a member of the Remote Desktop Users group or another group that has this right, or if the Remote Desktop User group does not have this right, you must be granted this right manually.
note :- All users that have been tested are a member of the Remote Desktop Users group.
steps are :
1. Run gpedit.msc. by clicik on start button and run command or (Window Key + r key together)
2. Navigate to Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> User Rights Assignment in the left side pane of the following screen
3. double click on Allow log in through Remote Desktop Service. following screen would appear
4. Click on Advance Button on the dialogue box.
5. Click on the Find now button on next dialogue box
6. Select Remote Desktop Users from the list and click on ok Button.
click on ok to close all dialogue.
Restart computer. now you can login without password from NComputing clients.