Although Kaspersky Internet Security (KIS) features a firewall that keeps malicious applications from transmitting information from your computer, false positives can cause the firewall to prevent even trusted applications from functioning normally. You can, however, let a blocked application through by temporarily disabling the firewall. Alternately, you can configure the KIS network rules to allow the blocked application through so that you can keep your computer protected without having to turn off the firewall.
Turn Off Firewall
On your Kaspersky Internet Security installation, click the "Settings" option, then click the "Protection Center" side-tab. Click the option labeled "Firewall," then drag the slider next to "Firewall" to the left to disable the KIS firewall. Turning off the firewall, however, leaves your computer vulnerable to malicious applications. To re-enable the KIS firewall, get to the Kaspersky Protection Center, click "Firewall," then drag the slider next to "Firewall" to the right.
Configure Application Rules
Instead of turning off the KIS firewall every time you want to let a blocked application through, you can opt to allow a specific application by configuring the KIS network rules. From the Kaspersky Protection Center, click "Firewall," then select "Configure Application Rules." Right-click the application you want to allow, then click "Details and Rules." Under the "Network Rules" tab, click "Add." On the pop-up box, click the drop-down menu next to action, then select "Allow." Click the "Add" button, then click "Save" to apply the changes.
Enable Windows Firewall
If you want to keep the KIS firewall disabled for the foreseeable future, you can opt to turn on the Windows Firewall instead to keep your computer protected. On the Start screen, type "Firewall" (without quotes), then select the "Windows Firewall" search result. Click the "Turn Windows Firewall On or Off" option, then click both the "Turn On Windows Firewall" radio buttons. Click "OK" to apply the changes.