IPSec HTTP connections

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HTTP/HTTPS connections via IPSec VPN

Last adaption: 02.2023

New:

Layout adjustment and screenshots updated
Addition to HTTPS

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This article refers to a Beta version

11.7

Introduction

HTTP/HTTPS requests are intercepted and processed by the HTTP proxy when Transparent Mode is enabled. ( For https requests, SSL interception must also be enabled.)
The HTTP proxy does not have to be configured in the client's settings.
If the HTTP/HTTPS server (destination of the HTTP/HTTPS request) can be reached via a VPN connection, these connections must be excluded from transparent mode, or the HTTP/HTTPS proxy must be adapted for the use of the VPN connection. This can be done either via an exception rule for transparent mode, or by setting the outgoing IP address of the HTTP/HTTPS proxy.

Scenario 1: Transparent exception rule

→ Applications →HTTP ProxyTab Transparent Mode Button Add transparent rule
If a VPN connection is to be excluded from transparent mode, a rule is added in the Transparent Mode tab.

Caption	Value	Description
Protocol:	HTTP HTTPS	HTTP is selected as default settings
Type:	Exclude	Exclude is selected
Source:	internal-network	The internal network internal-network is selected
Destination:	Destination IPSec network	Select the network object that is reachable via the IPSec connection to the HTTP server
Click Save to apply these settings. If an Include rule for HTTPS exists, an Exclude rule for HTTPS must also be created.

Scenario 2: Outbound proxy address

If the HTTP proxy is to be customized for use with the VPN connection, go to → Applications →HTTP ProxyTab General.

Under

General

the following is entered:

Caption	Value	Description
Outbound IP address:	192.168.112.1	Enter the internal IP address of the firewall. This IP should be in the subnet defined in phase 2 of the IPSec tunnel.
Click Save to apply these settings.

Advantages and disadvantages of both scenarios

Scenario 1: Transparent exception rule

Advantages:

HTTP traffic is routed, the network of the remote terminal sees the IP address of the client

Disadvantages:

The virus scanner in the HTTP proxy is not used for this connection

Scenario 2: Outbound proxy address

Advantages:

The HTTP request can be scanned by the virus scanner for malicious code

Disadvantages:

The network of the remote terminal only sees the IP address of the proxy.
If there are rule and / or source routes for the network, the HTTP proxy is also affected by them