Quickbooks - Error -6177, 0: QuickBooks is attempting to open this Company file

Use the following steps if the QuickBooks File Doctor can't run successfully on your computer or you prefer a manual solution.

1. Go to the computer that stores your company file(s) and close QuickBooks.
2. Delete the Network Descriptor (*.ND) file (QuickBooks creates this file automatically):
   1. Open the folder where the company file is stored and find the file with an .ND file extension; it looks something like MyCompanyFileName.QBW.ND.
   2. Right-click the .ND file and choose Delete.
3. Configure the QuickBooks Database Manager:
   1. Click the Windows Start button and choose Programs > QuickBooks > QuickBooks Database Server Manager. 
      Note: In Windows 8, on your keyboard, press Windows  type QuickBooks Database Manager, and then click QuickBooks Database Manager.
   2. Click the Add Folder button.
   3. Find the folder with the QuickBooks company file (or files) and click OK.
   4. (Optional) Repeat steps 3b and 3c to add additional folders.
   5. Click the Scan button. The QuickBooks company files found list shows all the company files QuickBooks Database Server Manager is hosting.
   6. After the scan is complete, click Close.

Check the company file access permissions in Windows.

http://support.quickbooks.intuit.com/support/articles/SLN41400