![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqtXnLwDYOxyl9mJLkBlixJB_TaBAxBWpmmMuFLJWje1xMgXpcdP1T0NkWahyphenhyphenaSptGk81jJXUG8_BtPzCA-xJZorMk9gYz-mo1eJ5Guj_9cJXUevf7xgWNaKguWxmFglIQDCxHov76zos/s400/Quickbooks_6123.png)
This error indicates a firewall of some sort is blocking Quickbooks communicating between the workstation and the server hosting the Data Manager.
This can be a hardware firewall such as a cable or DSL router/firewall. This can also be caused by software firewalls such as Norton Personal Firewall, McAfee's firewall, SmartFirewall, or any firewall utility built into an antivirus program.