* [Blog](https://www.paloaltonetworks.com.au/blog) * [Palo Alto Networks](https://www.paloaltonetworks.com.au/blog/corporate/) * [Firewall](https://www.paloaltonetworks.com.au/blog/category/firewall/) * HTTP Tunneling 101 # HTTP Tunneling 101 [](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.paloaltonetworks.com.au%2Fblog%2F2007%2F05%2Fhttp-tunneling-101%2F) [](https://twitter.com/share?text=HTTP+Tunneling+101&url=https%3A%2F%2Fwww.paloaltonetworks.com.au%2Fblog%2F2007%2F05%2Fhttp-tunneling-101%2F) [](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.paloaltonetworks.com.au%2Fblog%2F2007%2F05%2Fhttp-tunneling-101%2F&title=HTTP+Tunneling+101&summary=&source=) [](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https://www.paloaltonetworks.com.au/blog/2007/05/http-tunneling-101/&ts=markdown) \[\](mailto:?subject=HTTP Tunneling 101) Link copied By [Mike Jacobsen](https://www.paloaltonetworks.com/blog/author/mjacobsen/?ts=markdown "Posts by Mike Jacobsen") May 25, 2007 1 minutes [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown) [circumvention](https://www.paloaltonetworks.com/blog/tag/circumvent-security/?ts=markdown) [Firewall](https://www.paloaltonetworks.com/blog/tag/firewall/?ts=markdown) Network administrators are more and more concerned about scrutinizing the traffic that comes in and out of their networks, but applications and attackers know that they won't block HTTP traffic over port 80. So if you can't beat'em, join'em. Applications and attacks have quickly learned that they can evade firewalls and other security devices via HTTP tunneling. HTTP tunneling is a method of evading network firewalls and access control policies by encapsulating traffic in HTTP headers and sending it over the most open port in the network -- port 80. To learn about how applications and attackers are using this method to bypass firewall and router access control policies, click on the link below. [http://www.securityfocus.com/infocus/1793](http://www.securityfocus.com/infocus/1793) *** ** * ** *** ## Related Blogs ### [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown), [Government](https://www.paloaltonetworks.com/blog/category/government/?ts=markdown), [Next-Generation Firewalls](https://www.paloaltonetworks.com/blog/network-security/category/next-generation-firewalls/?ts=markdown), [Products and Services](https://www.paloaltonetworks.com/blog/category/products-and-services/?ts=markdown) [#### PAN-OS 8.1: SSL Decryption Broker for Federal Government](https://www.paloaltonetworks.com.au/blog/2018/03/gov-pan-os-8-1-ssl-decryption-broker-federal-government/) ### [Cloud NGFW](https://www.paloaltonetworks.com/blog/network-security/category/cloud-ngfw/?ts=markdown), [Cloud Security](https://www.paloaltonetworks.com/blog/category/cloud-security/?ts=markdown), [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown) [#### Modernizing Security on AWS: From Firewall Ops to Security Intent](https://www.paloaltonetworks.com.au/blog/network-security/modernizing-security-on-aws-from-firewall-ops-to-security-intent/) ### [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown), [Strata Network Security Platform](https://www.paloaltonetworks.com/blog/network-security/category/strata-network-security-platform/?ts=markdown), [Zero Trust Security](https://www.paloaltonetworks.com/blog/network-security/category/zero-trust-security/?ts=markdown) [#### Powering the AI Enterprise with New Software Firewall Capabilities](https://www.paloaltonetworks.com.au/blog/network-security/powering-the-ai-enterprise-with-new-software-firewall-capabilities/) ### [AI Application Security](https://www.paloaltonetworks.com/blog/network-security/category/ai-application-security/?ts=markdown), [AI Governance](https://www.paloaltonetworks.com/blog/category/ai-governance/?ts=markdown), [Announcement](https://www.paloaltonetworks.com/blog/category/announcement/?ts=markdown), [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown), [Next-Generation Firewalls](https://www.paloaltonetworks.com/blog/network-security/category/next-generation-firewalls/?ts=markdown), [Partners](https://www.paloaltonetworks.com/blog/category/partners/?ts=markdown), [Products and Services](https://www.paloaltonetworks.com/blog/category/products-and-services/?ts=markdown) [#### Palo Alto Networks Announces Support for NVIDIA Enterprise AI Factory](https://www.paloaltonetworks.com.au/blog/2026/01/support-nvidia-enterprise-ai-factory/) ### [5G Security](https://www.paloaltonetworks.com/blog/network-security/category/5g-security/?ts=markdown), [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown), [IoT Security](https://www.paloaltonetworks.com/blog/network-security/category/iot-security/?ts=markdown) [#### Protecting the Utility Grid's Digital Ecosystem, from Core to Edge to AI](https://www.paloaltonetworks.com.au/blog/network-security/protecting-the-utility-grid-digital-ecosystem-from-core-to-edge-to-ai/) ### [AI Security](https://www.paloaltonetworks.com/blog/category/ai-security/?ts=markdown), [Announcement](https://www.paloaltonetworks.com/blog/category/announcement/?ts=markdown), [Endpoint](https://www.paloaltonetworks.com/blog/category/endpoint-2/?ts=markdown), [Event](https://www.paloaltonetworks.com/blog/category/event/?ts=markdown), [Firewall](https://www.paloaltonetworks.com/blog/category/firewall/?ts=markdown), [Non categorizzato](https://www.paloaltonetworks.com/blog/category/non-categorizzato/?ts=markdown) [#### See How We're Fortifying Cloud and AI at AWS re:Inforce 2025](https://www.paloaltonetworks.com.au/blog/2025/06/fortifying-cloud-ai-aws-reinforce/) ### Subscribe to the Blog! 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