You didn't mention the type of firewall you use. Assuming it's a modern stateful inspection firewall, you don't need to worry about the high-numbered ports. If you want to allow Web traffic from the internal network out to the Internet, you simply need to allow port 80 traffic outbound. The firewall will recognize and handle the traffic for the related high-numbered port used by each connection.
More on network security :
Dig deeper on Network Firewalls, Routers and Switches
Related Q&A from Mike Chapple, Enterprise Compliance
The HHS security risk assessment tool is designed to help healthcare providers meet the HIPAA security requirement. Expert Mike Chapple explains how ...continue reading
PCI DSS requirement 6.6 demands application security compliance through one of two options: an application firewall or a code review. Expert Mike ...continue reading
Are HIPAA-compliant hosting services a better option for compliance than a secure storage API? Expert Mike Chapple analyzes.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.