QuickBooks Network Connection Failure is commonly reported by the users and there are a set number of steps that must be followed to fix it. I have faced similar error and here are the steps that I followed:
1.Restart your server and then do the same in all the workstations. 2.Check the network especially if you have a wireless connection. 3.Try opening or creating other format files on the server. If you cannot complete the action, review the Windows Access Permissions of your system. 4.Use Windows key and type Power Options to disable the power management settings on the server and if that does not do the trick, try the final solution.