git connection error

Git error: fatal: unable to connect a socket (Invalid argument)

Even after configuring the proxy, you might be unable to connect, since the proxy is disallowing git protocol traffic. In this case, you might want to try using "http" instead of "git"

H:>git clone http://github.com/akitaonrails/vimfiles.git

Also, if you are using an automated proxy config file (.pac), just open it in a text editor. It is quite a easy to following scripting language, with a bunch of conditions to re-direct to the most efficient proxy. Find the one that allows general purpose traffic (typically, the last configured proxy), and configure it as mentioned in the comment above.

In CTK, this can be configured by:

# Git protocol option

option(CTK_USE_GIT_PROTOCOL "If behind a firewall turn this OFF to use http instead." ON)
mark_as_advanced(CTK_USE_GIT_PROTOCOL)
set(git_protocol "git")
if(NOT CTK_USE_GIT_PROTOCOL)
  set(git_protocol "http")
endif()