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Quickbooks File Repair — Errors H101,H303, and H505 when opening a company file

Errors H101, H303, and H505 appear when opening a company file in multi-user mode and mean QuickBooks cannot reach the file on the computer that hosts it. The message reads: "You're trying to work with a company file located on another computer, and that computer needs additional installation and setup." All three codes point at the same family of hosting and networking problems.

What these errors mean

In multi-user mode, one computer hosts the .QBW file and the others connect to it. These H-series errors mean the connecting workstation cannot establish that link -- the host setup, the network descriptor, or the firewall is in the way.

Common causes

  • The .ND network descriptor file is damaged or incorrect.
  • Hosting configuration settings are wrong (more than one machine hosting, or the host not hosting).
  • A firewall is blocking incoming or outgoing QuickBooks communication.
  • The server's IP address cannot be resolved by the workstations.

What you can safely try first

  • Run the QuickBooks Database Server Manager on the host and re-scan the folder holding the .QBW file -- this regenerates a healthy .ND file.
  • Rename the existing .ND file and let QuickBooks rebuild it.
  • Verify hosting: only the host machine should have Host Multi-User Access enabled; workstations should not.
  • Add firewall exceptions for QuickBooks and its database service ports.
  • Confirm each workstation can ping the host by name and IP.

Symptoms you'll typically see

  • The file opens on the host but not from workstations.
  • One or more of H101, H303, or H505 on switching to multi-user mode.
  • Intermittent connection drops on an unstable network.

When professional recovery is the safer path

These errors are usually environmental. But if the file fails to open even locally on the host, or opens with data errors, the company file itself may be damaged. Our engineers repair corrupted .QBW files and return a clean, verified copy. We work in-house across North America, and our no-data, no-charge policy means you owe nothing if we can't recover your data.

See QuickBooks data recovery or start a recovery.