How to Solve “Workgroup is Not Accessible” and “Specified server cannot perform the requested operation”

Problem: These 2 error messages will pop-up when trying to connect to a Windows 7 PC from Windows XP PC.

Solution: need to perform 2 settings on both Windows 7 PC and Windows XP PC.

  1. refer to

    1. Step 1: Enable NetBIOS over TCP/IP
      1. Click Start, click Control Panel, and then click Network and Internet Connections.
      2. Click Network Connections.
      3. Right-click Local Area Connection, and then click Properties.
      4. Click Internet Protocol (TCP/IP), and then click Properties.
      5. Click the General tab, and then click Advanced.
      6. Click the WINS tab.
      7. Under NetBIOS setting, click Enable NetBIOS over TCP/IP, and then click OK two times.
      8. Click Close to close the Local Area Connection Properties dialog box.
      9. Close the Network Connections window.
    2. Step 2
      1. Click Start, right-click My Computer, and then click Manage.
      2. Double-click Services and Applications.
      3. Double-click Services.
      4. On the right side, right-click Computer Browser, and then click Start.
      5. Close the Computer Management window.
    1. Run GPedit.msc
    2. Expand Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
    3. Open the properties for Network security: LAN Manager authentication level
    4. Set the value to: Send LM & NTLM responses
    5. Run Services.msc
    6. Restart the Server service