I am running dual boot between XP pro and Vista build 6000 Ultimate.
In Vista, I can attach to printers on the domain by opening the
\\server\device in RUN and then logging on with domain\user and password.
If I try to map a network server I get the same dialog box and enter
'domain\user and password. Then I get this error message :
The mapped network drive could not be created because the foillowing error
has occured :
A Device attached to the system is not functioning
I can log on to Outlook on the Exchange server with same logon and Internet
and everything is fine. In the Network, I can see all servers.
I tried the promising tip found here :
By: Jimmy Brush In:
microsoft.public.windows.vista.administration_acco unts_passwords

Hello,

Please try the following steps ... this will change the way Windows Vista
authenticates with other computers to the same setting that Windows XP uses.

*** These steps change default security settings of Windows Vista.
*** The result: your machine will be less secure by changing these settings.

- Click Start
- Click Control Panel
- Click System and Maintenance
- Click Administrative Tools
- Double-Click Local Security Policy
- In the left pane, click the triangle next to Local Policy
- In the left pane, click Security Options
- In the right pane near the bottom, double-click "Network security: LAN
manager authentication level"
- Click the drop-down box, and click "Send LM & NTLM responses"
- Click OK

Even after a reboot, this did not change the situation

I believe that the problem only occurs with servers with DFS - Distributed
File system in this corporate environment.
I also forgot to say that the computer is not assigned to the domain, only
to a dummy workgroup. This has worked fine in XP, Win2000 etc.

NEWT utility to find IP address of Browsed around other sites for answers -
to no avail.
I tried :
Logging on with user@domain instead of domain\user. Claim user/password is
incorrect
Logging on with instead of domain\user. Claim user/password
is incorrect
Enabled NETBIOS over TCP/IP. No changes
Tried logging on from DOS box with various variants of NET USE. System error
59 has occurred. An unexpected network error occurred.
Used NEWT utility to find IP-address of DFS server and tried various formats
of users. No luck.

SOLVED !!

Service 'Routing and Remote Access' is required for this.
Go to control panel - Admin tools - services.
Scroll down to 'Routing and Remote Access'.
Go to properties and set start-up to automatic and start the service.