Enable NLA on Windows XP
If you have a Windows Vista or Windows 7 box and you have Terminal Services enabled witht he NLA (Network Level Authentication) you will need to enable NLA for XP, to complete this action follow the instructions below:
To enable NLA in XP machines; first install XP SP3, then edit the registry settings on the XP client machine to allow NLA
1. Click Start, click Run, type regedit, and then press ENTER.
2. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlLsa
3. In the details pane, right-click Security Packages, and then click Modify.
4. In the Value data box, type tspkg. Leave any data that is specific to other SSPs, and then click OK.
5. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProviders
6. In the details pane, right-click SecurityProviders, and then click Modify.
7. In the Value data box, type credssp.dll. Leave any data that is specific to other SSPs, and then click OK.
8. Exit Registry Editor.
9. Restart the computer.
To enable NLA in XP machines; first install XP SP3, then edit the registry settings on the XP client machine to allow NLA
1. Click Start, click Run, type regedit, and then press ENTER.
2. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlLsa
3. In the details pane, right-click Security Packages, and then click Modify.
4. In the Value data box, type tspkg. Leave any data that is specific to other SSPs, and then click OK.
5. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProviders
6. In the details pane, right-click SecurityProviders, and then click Modify.
7. In the Value data box, type credssp.dll. Leave any data that is specific to other SSPs, and then click OK.
8. Exit Registry Editor.
9. Restart the computer.