Please check the following points:
If a personal firewall software (or anti-virus software) is installed on your PC, temporarily disable it. For instructions on how to disable this type of program, please refer to the user's guide for your software or contact the software manufacture.
Once the firmware upgrade or I-FAX feature installation is completed, enable the program again.
How to check if the 'Internet Connection Firewall' is running:
Click 'Start' and then 'Control Panel'.
Select 'Network Connections'.
Right click 'Local Area Connection' and select 'Properties'.
Click the 'Advanced' tab and make sure that the 'Internet Connection Firewall' check box is disabled.
Once the firmware upgrade or I-FAX feature installation is completed, you can reactivate the Firewall settings.