What Does Error Code 6123 Mean?

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QuickBooks Error Code 6123 means Connection to the QuickBooks company file is lost. It crops up in multi-user environments due to:

The system connection between the computer on which the blunder occurred and the server hosting the company folder was interrupted.
Firewall software is overcrowding a port essential to communicate with the server hosting the company folder
multiple occurrences of the QuickBooks database service are an organization
QuickBooks data or program files are damaged
the computer name on the computer hosting the QuickBooks company folder was changed while hosting was turned on
the McAfee Privacy Service is installed with the Block Web virus filter option selected

The last 2 possible reasons are the easiest to troubleshoot. The Block Web virus filter in McAfee’s software is incompatible with QuickBooks and needs to be turned off. If the computer name on the computer hosting the company file was changed, close all applications, reboot that computer, and the first stop and re-start multi-user mode. Specific steps for these possible causes are discussed in this QuickBooks Error 6123 knowledge base article.