When attempting to connect to a VisionFS host with a valid username and password from Windows NT 4 with Service Pack 3 installed, you get a dialog box:

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Problem: When attempting to connect to a VisionFS host with a valid username and password from Windows NT 4 with Service Pack 3 installed, you get a dialog box:

\\is not accessible.
You are not authorized to log in from this station.

Cause: After installing Service Pack 3, everything disappears from the Network Neighborhood. The SMB protocol can transfer the authentication password in two ways: plain (unencrypted) or encrypted. By default, the VisionFS server uses plain text passwords. Before installing Service Pack 3, NT accepted both methods. But after installing Service Pack 3, NT allows authentication only using encrypted passwords (by default).

 

Solution: To resolve this problem re-enable the use of plain passwords in NT through the Windows NT Registry.

Edit the Windows registry, Start->Run, and run the command “regedit”. To enable plain network passwords in post-Service Pack 3 NT 4.0:

WARNING: Using the registry editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT. Microsoft cannot guarantee that any problems resulting from the use of the registry editor can be solved. Use this tool at your own risk.

Go to the following key in the Windows registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Rdr\Parameters

With this key open, go to the menu and select “Edit/New…/DWORD Value “.

This will create an icon in the right hand pane of the registry below the ‘Default Value’. Name this entry as:

EnablePlainTextPassword

Highlight this entry and select “Edit/Modify”. In the ‘Value Data’ field type the number 1. Click OK and exit the registry editor program.

Reboot Windows NT.

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