[KB6907] Apache HTTP Proxy connection failed (6.x)

Follow the steps below to allow the forwarding of network communication in Apache HTTP Proxy:

1. Open the Apache HTTP Proxy configuration file for editing. The file name and its location can vary depending on the operating system:

• Windows: C:\Program Files\Apache HTTP Proxy\conf\httpd.conf
• Linux - Debian distributions: /etc/apache2/mods-enabled/proxy.conf
• Linux - Red Hat distributions: /etc/httpd/conf/httpd.conf

2. Add one or more <‎ProxyMatch> Directives. Use the following syntax:
   
   <‎ProxyMatch regex>

Allow from all

<‎/ProxyMatch>

In each <‎ProxyMatch> segment, you can specify (as a regular expression) the address (IP or domain) to which you want to allow forwarding of the network communication.

See examples below on how to use regular expressions.

3. Save the configuration file and restart the Apache HTTP Proxy service.
    
4. Verify if the new connection forwarding settings are working.

Examples - regular expressions:

1. Allow an IP address (in this example https://10.20.30.40):

<‎ProxyMatch ^([h,H][t,T][t,T][p,P][s,S]?://)?([^@/]*@)?(10.20.30.40)>

Allow from all

<‎/ProxyMatch>

2. Allow the specified web domain (in this example https://eset.com and any of its subdomains https://*.eset.com):

<‎ProxyMatch ^([h,H][t,T][t,T][p,P][s,S]?://)?([^@/]*@)?([a-zA-Z0-9-]{0,63}\.)?[a-zA-Z0-9-]{0,63}\.[e,E][s,S][e,E][t,T]\.[c,C][o,O][m,M](:[0-9]+)?(/.*)?$>

Allow from all

<‎/ProxyMatch>

3. Allow all IP addresses in a specified subnetwork (in this example https://10.20.30.* and https://40.50.60.*).

<‎ProxyMatch ^([h,H][t,T][t,T][p,P][s,S]?://)?([^@/]*@)?(10.20.30.|40.50.60.)([0-9]+)(:[0-9]+)?(/.*)?$>

Allow from all

<‎/ProxyMatch>