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The specified network provider name is invalid

Situation: when accessing shared folder or printer in Windows Vista or windows 7, you may receive this message “The specified network provider name is invalid”

Case 1: Make sure all computer have the Microsoft Client for Microsoft Networks installed.
If this client is not installed, you can install it using the following steps:
1. Click Add.
2. Click Client, and then click Add.
3. Click Microsoft, click Client For Microsoft Networks, and then click OK.
4. Click OK.
5. When you are prompted to restart your computer, do so.

Case 2: I managed to find out that the problem was with "File and Printer Sharing for Microsoft Networks". I went to the properties dialog of my connection, uninstall that service. After that, I clicked on install and selected service and reinstalled the same service. After restarting the computer, I was able to access my network folders.

Case 3: Make sure no firewall or security software block sharing.

Case 4: Reset Network security. Please follow this step to fix the issue:
1. Click Start->Click Control Panel.
2. Click System and Maintenance-> Click Administrative Tools.
3. Double-Click Local Security Policy.
4. In the left pane, click the triangle next to Local Policy.
5. In the left pane, click Security Options.
6. In the right pane near the bottom, double-click "Network security: LAN manager authentication level".
7. Click the drop-down box, and click "Send LM & NTLM responses". Click OK.




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