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I have a Raspberry Pi running Arch Linux ARM that I use as an HTTP server, with Apache/2.4.29 (Unix). Recently, I have been trying to configure this machine as a forward proxy in order to use corkscrew or proxytunnel to connect to the Internet while using my laptop behind an evil firewall. So I added a virtual server with the following configuration:
<VirtualHost *:80>
ServerAdmin webmaster@mydomain.com
ServerName proxy.mydomain.com
ErrorLog "/var/log/httpd/proxy-error_log"
CustomLog "/var/log/httpd/proxy-access_log" common
#SetEnv force-proxy-request-1.0 1
#SetEnv proxy-nokeepalive 1
ProxyRequests On
ProxyVia Block
AllowCONNECT 443 563 22 XYZ
<Proxy *>
Require ip XXX.XXX.XXX.XXX
</Proxy>
# The reverse proxy works, but the forward doesn't
#ProxyPass /test https://google.it
</VirtualHost>
Besides that, I have two other virtual servers. The interesting thing is that the proxy works if it is the only virtual host enabled, but if I enable another vhost the proxy does not work anymore.
When the proxy does not work, I cannot use it with firefox (which says that the proxy is refusing connections), nor can I use it with corkscrew (which says that the proxy cannot connect to the server: method not allowed); also, in this situation the apache log file says "client denied by server configuration: /etc/httpd/htdocs". However, when I enable only the proxy virtual host, everything works, so it is not corkscrew's problem. Do someone know why? Thank you.
1This is really awful. If anybody finds a way around it, please update... – Daniel – 2019-09-02T19:53:47.423