Looks like Astaro is effected when using transparent proxy. See details >
Socket Capable Browser Plugins Result In Transparent Proxy Abuse >>
http://www.thesecuritypractice.com/the_security_practice/TransparentProxyAbuse.pdf
Intercepting proxy servers may incorrectly rely on HTTP headers to make connections, Warnung des US-CERT>>
US-CERT Vulnerability Note VU#435052
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