In company A there is a corporate proxy server, direct Internet access there.
There are, of course, ssh & socks5 tunnel via the proxy, well, it's obviously not going to help.
HTTPS and the CONNECT method on the proxy is enabled.
Objective: through the proxy of the company And to connect to another corporate VPN from company B.
VPN connects through L2TP & GRE connection is only possible with a corporate laptop the company B, which physically can be included in the company's network and, well, there is access to the proxy.
In addition to the OpenVPN tunnel via port 443 proxy within which to try to raise the L2TP+GRE tunnel in the network of company B, in a head did not come.
Do you think this will work?