......
Go to Start > Run. Type: regedit, and browse to:
Path: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order]
Value: "ProviderOrder"="RDPNP,LanmanWorkstation,WebClient,npnotes
N.B : npnote s is the registry key associated to the Lotus Notes Single Logon.
Please note that with Windows 64 bit operating systems the key will now read npnotes64
Ensure that the Value in the "ProviderOrder" is as above. The npnotes key should always be right after "WebClient". If npnotes appears twice, remove the second entry or if there is any other "Key registry" other than the "npnotes" after the "WebClient" key, switch them back so that the "npnotes" is the key right after "WebClient". Restart the machine. This fixes most of the NSL problems 80% of the time.
Example:
Incorrect
Path: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order]
Value: "ProviderOrder"="RDPNP,LanmanWorkstation,WebClient,PssoCM32,npnotes"
Correct
Path: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order]
Value: "ProviderOrder"="RDPNP,LanmanWorkstation,WebClient,npnotes,PssoCM32"