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QuickBooks Error 77

QuickBooks Error 77

QuickBooks error 77 of the 6000 series is generally related to the company file or network connection. All the errors of the 6000 series are related to the company file in some way. Either QuickBooks cannot work with the file or it cannot access the company file. In both of these cases, you get the same error. However, in some cases, you may get errors that are specific to networking along with company file errors.

In order to fix QuickBooks error 77, you can launch Quickbooks as an administrator or you can ensure that your company file is saved on the local drive rather than an external drive. These two solutions make sure that QuickBooks has permission to work on the operating system and the connection to the company file.

In this post, you’ll learn how to fix QuickBooks error 77.

What is Causes of QuickBooks error 77?

QuickBooks error 77 -6000 occurs when QuickBooks cannot connect to the company file, so it throws the error and crashes immediately. The errors can result from damaged company files or damaged ND and TLG files. Further firewall rules and internet settings may also prevent connection to the company file.

Solutions for QuickBooks Error 77

We will start with scanning the company file so that we can ensure that the damage isn’t permanent. Then will move to words resolving issues related to the directory files then the program files and then the internet settings. Let’s get started.

Solution #1: QuickBooks file doctor

QuickBooks tool hub is freeware available on the Internet. Its primary purpose is to help you navigate through various issues and problems that arise from this accounting software. As you can see that you don’t have to pay for this tool, you can definitely use it to fix some of the network and company file errors related to QuickBooks.

Here are the steps to use the File Doctor to resolve QuickBooks error 77, 6000:

  1. Download the QuickBooks Toll Hub from Intuit’s website.
  2. Launch the installer
  3. Follow the on-screen instructions until the program is installed. 
  4. Click on finish
  5. Go to the start menu and launch the quickbooks tool hub.
  6. Choose quickbooks file doctor and scan the company file and network for possible issues.

If the file doctor finds another it will try to fix it but if it can’t fix the error it will inform you of the underlying cause so that you can take necessary steps to prevent damage to you data file and also recover your data in the meanwhile.

Solution #2: Reset .ND and .TLG files

These files are related to configuration of your accounting software. They also manage the network mode so they are essential to enable multi-user mode and collaboration while working in QuickBooks. If these files are damaged then quickbooks won’t open and will crash immediately because it won’t be able to connect with the company.

Here are the steps to reset the .ND and .TLG files when you get the QuickBooks error 77:

  1. Go to the location of your company file.
  2. Find the .ND and the .TLG files.
  3. Right-click on each of the files and add .old at the end of their name.
  4. Now launch QuickBooks desktop and open your company file.

This is an easy way to reset these files so that Quickbooks can create new ones that you can rely upon for properly connecting to the company file with the software and fixing the error. Deleting these files doesn’t have any impact on your software because these files are automatically recreated by the software when you launch it again.

Solution #3: Enter UNC path in place of Mapped Drives

A UNC path is more detailed than the mapped drive. Mapped drives are used in this accounting software to keep track of the company files stored on the server. This is generally done by the database server manager so that it can constantly check for changes and sink them immediately.

Here are the steps to change to UNC path to fix QuickBooks error 77:

  1. Go to the start menu and type in QuickBooks.
  2. Right-click on QuickBooks, then choose to run as administrator
  3. While holding the control key, launch the accounting software. 
  4. When the no company open window appears, go to the file menu. 
  5. Click on open or restore company
  6. Click on open a company file then choose next
  7. From the left hand menu click on network and go to the directory containing the company file.
  8. Set the appropriate permissions for the folders that contain the company file so that the operating system won’t prohibit other workstations from connecting to the company file.
  9. Now choose the company file and click on open.

After entering the UNC path you can sync data easily and have the database server manager work more closely with the main software. The changes are synced in real time, so they should appear as soon as you make them.


As you’ve gone through all these steps, you may have found all of the problems that occurred with the company file or the network connection. Most users will have resolved the QuickBooks error 77 now, so you can move ahead and look at the FAQ we’ve provided below.


  1. Will the new ND and TLG files create problems after resolving QuickBooks error 77?

    Deleting either of these files will not have any negative impact on your accounting software because both of these files are recreated as soon as you launch the software again. The ND and TLG files contain important information about the location and directory of your company file, but you can open a company file and a new directory file will be created immediately to store its location. So you don’t have to worry about anything when it comes to these files.

  2. What should I do if the file doctor cannot resolve QuickBooks error 77?

    The file doctor is a utility present in the tool hub. When you use the tool hub, you can scan the company file and the program files for errors. If the file doctor cannot resolve the problem related to the company file, then you may be dealing with a complex network issue or company file damage. In the latter case, you should reach out to our experts who can help you in recovering your data and create a new company file that has no errors and that can easily work with the software.

  3. Can I get the QuickBooks error 77 because of network issues?

    Yes, this error can occur because of network issues. When your internet is not working properly or when the connection to quickbooks is being blocked by internet settings or Firefall then you won’t be able to connect with the company file. This will lead to the 6000 series error or the h series error. You can find underlined network issues by troubleshooting network errors or connecting with your internet service provider or creating rules for firewall and Internet explorer.


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