.ND and .TLG are configuration files that allow QuickBooks Desktop to access the company file(s) in a network or in multi-user mode. Corrupted or damaged .ND or .TLG files can cause errors when opening QuickBooks Desktop. Renaming these files does not cause data loss since these are automatically recreated when you open the company file or scan the company files using QuickBooks Database Server Manager.
Open the folder that contains your company file. Default Location: C:\Users\Public\Public Documents\Intuit\QuickBooks\Company Files
Find the files with the same file name as your company file but with extensions .ND and .TLG. Example: company_file.qbw.nd, company_file.qbw.tlg
Rightclick .nd/.tlg file and select Rename. Add the word ".old" after the file extension and press enter. Example: company_file.qbw.nd.OLD, company_file.qbw.tlg.OLD
Solution 3: Use UNC path instead of mapped drive
Right-click the QuickBooks icon on your desktop, press and hold the Ctrl key on your keyboard, and select Run as Administrator. Hold down the Ctrl key until you have the No Company Open window. Note: Holding down the Ctrl key prevents QuickBooks Desktop from auto-opening a company file.
From the File menu, select Open or Restore Company > Open a company file > Next.
In the left pane, click Network,and navigate to the location of your company file. Note: If you can't find the folder where the company file is saved, you may need to set folder permissions.
Select the company file and click Open.
Solution 4: Configure firewall and security software