The command "git clone <https://github.com/user/project.git>" times out when being used through an https proxy.

I've successfully had git functioning behind a proxy before, and have read other stackoverflow related to git and proxy usage. Now I've configured it on a host in my current organization to use a non-authenticating proxy, but it's timing out.

* the proxy is squid, non-authenticating
* directly connecting via TCP-443 is not an option
* I've confirmed that git is contacting the proxy
* Git issues the command "CONNECT github.com:443 HTTP/1.1"
* The proxy allows the request and connects to github.com on port 443
* libcurl verifies github's cert and establishes an SSL connection (SSL\_RSA\_WITH\_RC4\_128\_SHA)
* git proceeds to sit there, waiting for something that never happens
* timeout occurs

Has anyone experienced this before? Have any tips?

Here's the system version:

```
$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.4 (Santiago)

```

Here's the git version and update information (latest available in RH)

```
$ git --version
git version 1.7.11.3

$ sudo yum check-update git    
Loaded plugins: downloadonly, rhnplugin, security
This system is receiving updates from RHN Classic or RHN Satellite.

```

Here's the relevant environmental variables:

```
$ export | grep http
declare -x http_proxy="http://proxy.hostname:3128/"
declare -x https_proxy="http://proxy.hostname:3128/"

```

Here's my .gitconfig (for redundancy):

```
$ cat ~/.gitconfig
[http]
        proxy = http://proxy.hostname:3128/
[https]
        proxy = http://proxy.hostname:3128/

```

Here's an example of git running (and eventually timing out):

```
$ GIT_CURL_VERBOSE=1 GIT_DEBUG_LOOKUP=1 GIT_TRANSLOOP_DEBUG=1 GIT_TRANSPORT_HELPER_DEBUG=1 git clone https://github.com/user/project.git 2>&1
Cloning into 'project'...
Debug: Remote helper: -> capabilities
Debug: Remote helper: Waiting...
Debug: Remote helper: <- fetch
Debug: Got cap fetch
Debug: Remote helper: Waiting...
Debug: Remote helper: <- option
Debug: Got cap option
Debug: Remote helper: Waiting...
Debug: Remote helper: <- push
Debug: Got cap push
Debug: Remote helper: Waiting...
Debug: Remote helper: <- 
Debug: Capabilities complete.
Debug: Remote helper: Waiting...
* Couldn't find host github.com in the .netrc file; using defaults
* About to connect() to proxy proxy.hostname 3128 (#0)
*   Trying 10.22.74.73... * Connected to proxy.hostname (x.x.x.x) port 3128 (#0)
* Establish HTTP proxy tunnel to github.com:443
> CONNECT github.com:443 HTTP/1.1
Host: github.com:443
User-Agent: git/1.7.11.3
Proxy-Connection: Keep-Alive
Pragma: no-cache

< HTTP/1.0 200 Connection established
< 
* Proxy replied OK to CONNECT request
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using SSL_RSA_WITH_RC4_128_SHA
* Server certificate:
*   subject: CN=github.com,O="GitHub, Inc.",L=San Francisco,ST=California,C=US,serialNumber=C3268102,incorporationState=California,incorporationCountry=US,businessCategory=Private Organization
*   start date: May 27 00:00:00 2011 GMT
*   expire date: Jul 29 12:00:00 2013 GMT
*   common name: github.com
*   issuer: CN=DigiCert High Assurance EV CA-1,OU=www.digicert.com,O=DigiCert Inc,C=US
* Connected to proxy.hostname (x.x.x.x) port 3128 (#0)

```

Here's the squid log:

```
1367957877.701  60148 x.x.x.x TCP_MISS/200 3765 CONNECT github.com:443 - DIRECT/204.232.175.90 -

```

So, what's going on here? Does anyone have any ideas?