QuickBooks Error -6073, -816 -- File Already Open or Hosted Elsewhere

QuickBooks error -6073, -816 blocks access when the company file is already open in single-user mode or stored in a synced folder; our steps resolve the lock and restore access.

QuickBooks Error -6073, -816 is a multi-mode file access conflict. It fires when QuickBooks Desktop tries to open a company file in multi-user mode but the file is either already open in single-user mode on another workstation, or the file path passes through a folder that applies read-only or lock attributes that QuickBooks cannot negotiate. Our engineers treat this as one of the most common 6000-series errors on networks with mixed-mode usage.

What the Error Message Says

The dialog typically reads:

"QuickBooks is attempting to open this company file: [filename].qbw. Error code: -6073, -816."

In some versions the message continues with a statement that QuickBooks cannot open the file in the mode requested and that the file may be open in single-user mode on a different machine.

What the Code Means

Error -6073 and -816 together signal a condition QuickBooks internally classifies as a restricted-access open attempt. The -6073 component indicates the file is locked by an existing session. The -816 component indicates that the lock type conflicts with the mode being requested — most often single-user exclusive when multi-user shared is needed, or vice versa. QuickBooks Desktop cannot override the existing session lock, so it returns both codes.

What Triggers It

The three scenarios our engineers see most frequently are:

1. The file is open in single-user mode on another workstation. The most common trigger. One user has the file open exclusively, and a second user attempts to open it.
2. The file is stored in a read-only or cloud-synced folder. Folders managed by OneDrive, Google Drive, Dropbox, or similar sync engines apply file-system attributes that QuickBooks interprets as read-only. The database manager cannot create the temporary lock files it needs.
3. The hosting configuration is mismatched across workstations. Hosting is enabled on a workstation that is not the server, or hosting is enabled on multiple machines simultaneously, causing QuickBooks to route the open request to the wrong host.

How to Fix It

Scenario 1: File open in single-user mode elsewhere

1. Ask all users to close QuickBooks on every workstation.
2. On the machine acting as the server, open QuickBooks and the company file.
3. Go to File > Utilities. If you see Switch to Multi-user Mode, select it. If you see Host Multi-User Access, do not select it yet — first switch the file mode.
4. Once the file confirms it is in multi-user mode, have other workstations open the file from the mapped network drive or UNC path.

Scenario 2: File stored in a synced or read-only folder

1. Close QuickBooks on all machines.
2. Move the .qbw file from the synced folder to a local folder on the server, such as C:\QuickBooks\ or C:\Public\Public Documents\Intuit\QuickBooks\Company Files\.
3. Right-click the new folder, select Properties, and confirm the folder is not marked Read-only.
4. On the server, open the file in QuickBooks, then go to File > Utilities > Host Multi-User Access.
5. Open File > Utilities again and confirm Host Multi-User Access no longer appears (only Stop Hosting Multi-User Access should be visible), confirming hosting is active.
6. On each workstation, map a network drive to the server folder and open the file from that drive.

Scenario 3: Hosting enabled on the wrong machine

1. On every workstation, open QuickBooks and go to File > Utilities.
2. Look for Host Multi-User Access. If you see it, hosting is off on that machine — which is correct for a workstation. If you see Stop Hosting Multi-User Access, select it to turn hosting off.
3. On the server only, confirm Stop Hosting Multi-User Access is visible, meaning hosting is on.
4. Restart the QuickBooks Database Server Manager service on the server: open Services (services.msc), right-click QuickBooksDBXX (where XX is the version number), and select Restart.
5. In the Database Server Manager, run a full scan of the folder containing the company file.

How to Prevent It Recurring

Store the company file on a local drive on the server — never in a cloud-synced folder. Designate one machine as the host and keep hosting off on all workstations. Train users to switch to multi-user mode at the start of each session rather than defaulting to single-user. Run the Database Server Manager scan after any folder move or QuickBooks update.