I asked this question in the Microsoft Answers forum, and I was directed to this forum. I hope you can help. I am running Windows 7 Ultimate 64-bit Service Pack 1. I have the latest updates. I am unable to connect to a network drive. This applies to other computers in the network (HOME), NAS drives, or drives on my companies' network accessed over VPN. Let me give you a specific example. I am trying to map my NAS drive. It is named HPMediaVault, and is on 192.168.1.103 I can ping the device. I can ftp to the device, and connect as anonymous. I have set the Local Security Policy > Local Policy > Security Options > Network security: LAN Manager authentication level ... to ... Send LM & NTLM - use NTML2 session security if negotiated. (as noted in one Windows 7 answer). This did not work. I disabled IPv6 as noted in one Windows 7 answer. This did not work. My wife's PC, running Windows 7 Professional 32-bit, can map to the network drives just fine. It is not a problem with the drive. I have disabled my anti-virus (Norton AntiVirus version 18.6). It makes no difference. I have tried to map a network drive by name (HPMediaVault) and IP (192.168.1.103), and neither method works. I have tried to map the drive in the command windows using (net use X: \\drive), and this does not work. I have tried this in the XP Virtual Machine. It seems to get closer. It actually recognizes the name of the drive, but does not map it. I am at my wits end. This has been ongoing for some time. I wish I could recall what happened to make it stop working. It did work during the original install. Since I only use the network drives for backup, I didn't notice it for about 6 months. So, it could have happened anywhere.

I had posted this to some friends elsewhere, and here is the solution that worked for me. Set the Local Security Policy > Local Policy > Security Options > Network security: LAN Manager authentication level ... to ... Send LM & NTLM I have previously used the setting of "Send LM & NTLM - use NTML2 session security if negotiated". This did not work for me. The "Send LM & NTLM" worked immediately. I began to see my network drives, both on and off of VPN. Hopefully this will save others the frustration.http://www.TechnicalTrainer.org