Quickbooks File Repair — "Connection to company file has been lost"

"Connection to company file has been lost" is the message QuickBooks shows when it can no longer reach the file it had open, and it usually points to data damage in the backend Sybase database that stores your company file. Our team recovers from this error and returns a working file without data loss.

What this error means

QuickBooks stores your company data in a Sybase-based database engine behind the .QBW file. The "Connection lost" message means QuickBooks dropped its live link to that backend mid-session. While a network hiccup can trigger it, a recurring or unrecoverable version typically signals damage in the underlying data file itself.

Symptoms you'll typically see

• QuickBooks abruptly reporting the connection to the company file has been lost.
• The file failing to reopen, or reopening with errors, after the drop.
• The message recurring even on a stable local connection -- a sign the cause is in the file, not the network.

What you can safely try first

• If the file is shared, confirm the network connection to the host is solid and that only one machine is hosting it.
• Restart the host computer and the QuickBooks Database Server Manager, then try reopening the file.
• Make a copy of the current .QBW before testing further, and run Verify Data if the file will open.

When professional recovery is the safer path

When the connection keeps dropping on a healthy network, the damage is inside the Sybase backend and QuickBooks cannot heal it on its own. Our engineers have the expertise to recover from this error: we read the data directly out of the backend structure, repair the damaged database, and rebuild a file that opens and stays open -- without losing your transactions or lists.

Why bring it to us

We do this work in-house in North America, never outsourced, and there is no charge if we cannot recover your data.

See QuickBooks data recovery for details, or start a recovery when you're ready.