When the program is unable to access the company file, QuickBooks Error 6123 happens. This is frequently the result of corrupted files, network problems, or antivirus incompatibilities. It stops the file from being opened or restored. Verify file permissions, temporarily turn off security software, and make sure the network is configured correctly for several users to access it. For professional help and support with QuickBooks, give 1.855.738.2784 a call.