Facing QuickBooks error code 6000? After trying this, it won’t trouble you. QuickBooks error 6000 occurs because of multiple reasons like corrupted TLG file, improper QuickBooks installation, damaged company file, firewall blocking the communication, or maybe multiple users have logged-in at the same time. It typically occurs when a user tried to open the company file. The foremost effective fix is to reconfigure the firewall settings; open the QuickBooks company enter another location or rename the .TLG or .ND files. And if the error code appears with another numeric code, then you need to take the steps accordingly. Don’t know, how! No worries. Get in-tuned with our experts and resolve the matter quickly.