Run QuickBooks error 6143 File Doctor Tool:
Use this tool to automatically detect and fix company file and network errors.

Check Network Setup:
Ensure the host computer is correctly configured.
Verify all workstations are on the same network and have appropriate access.

Restore Backup:
Use a previous backup of your company file to restore data.

Disable Conflicting Software:
Temporarily disable antivirus and other third-party software to check for interference.

Read Also: QuickBooks error 6190

Rename.ND and . TLG Files:
Add ".old" to these file extensions to reset network data files.

Use QuickBooks Install Diagnostic Tool:
Fix issues related to QuickBooks installation.

Reinstall QuickBooks:
Uninstall and then reinstall QuickBooks to address underlying issues.

Implementing these steps can help resolve QuickBooks error code 6143 and restore normal operation to QuickBooks.