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mapping via name or ip?
do you get anything if you just do \\ip-address?
Were you ever able to access/map the DNS-320 via any PC on your LAN?
Windows 7? Have you got file sharing and network discovery enabled? Windows firewall enabled or other software firewall?
Try disabling/enabling the PC NIC. If that doesn't work, try uninstalling and reinstalling the NIC drivers on your PC. There may be some corruption (or setting change) preventing discovery of random network resources.
Tried disabling, doesn't work. Will get my drivers and try it tomorrow. Hopefully it'll work!
Have you try mapping from command prompt? Eg. net use z: \\ipaddr\Volume_1Also check if W7 Credential Manager (from Control Panel) and delete entry relating to your NAS.