Check for Computer Firewall Malfunctions

Firewall software running on most computers is intended to prevent unwanted network traffic from disrupting its operation. Unfortunately, these software firewalls can malfunction and start blocking valid Internet traffic. When two software firewalls, such as Windows Firewall plus a third-party product, are installed on the same computer, contention between the two can also incorrectly block traffic.

Action - If you've recently installed or upgraded software firewalls on your computer, temporarily disable them to determine whether it may be the cause of Internet connection problems.