wazilla

I'm not really sure which proxy-software is used, i think it's squid-cache. For development i've added https://github.com/genotrance/px as "ntlm-proxy" running on my local machine. Because our corporate proxy needs NTLM-authentifaction...

Almost ;-) You're still using wget for obtaining the latest version. So wget needs to pick up the proxy too. For this, the variable needs to have the name "HTTP_PROXY"...