If Windows 7 runs open DNS resolver, we can avoid it by setting up Windows firewall. Please follow these steps.
![](/netsys/_media/faq:windows_firewall01.png)
In the left pane, click Inbound Rules.
In the right pane, click New Rule.
![](/netsys/_media/faq:windows_firewall02.png)
Click Port
Click Next
![](/netsys/_media/faq:windows_firewall03.png)
On the Protocol and Ports page, Click UDP.
Click Specific Local Ports
Type 53 in the text box
Click Next
![](/netsys/_media/faq:windows_firewall04.png)
On the Action page, select Block the connection.
Click Next to continue
![](/netsys/_media/faq:windows_firewall05.png)
Select all the profiles available for different type of connections (Domain, Private and Public).
Click Next
![](/netsys/_media/faq:windows_firewall06.png)
Give a name of the rule, Let me use “DNS_resolver” for example.
You can add description to the new rule (optional)
Click Finish
![](/netsys/_media/faq:windows_firewall07.png)