$ git --version && uname -a && curl-config --version
git version 2.0.1
Linux localhost 3.15.3-1-ARCH #1 SMP PREEMPT Tue Jul 1 07:32:45 CEST 2014 x86_64 GNU/Linux
libcurl 7.37.0
$ mkdir foo; cd foo
$ git --bare init
Initialized empty Git repository in /home/user/foo/
$ git update-server-info
$ cd ..
$ sudo mount -t davfs https://dav.box.com/dav ./box
$ cp -r foo box
$ sudo umount box
$ rm -r foo
$ cat > .netrc << EOF
> machine dav.box.com
> login [[ redacted ]]
> password [[ redacted ]]
> EOF
$ chmod 600 .netrc
$ GIT_SMART_HTTP=0 git clone https://dav.box.com/dav/foo
Cloning into 'foo'...
warning: You appear to have cloned an empty repository.
Checking connectivity... done.
$ cd foo/.git/hooks 
$ mv post-update.sample post-update        
$ cd ../..
$ touch bar
$ git add .
$ git commit -a -m "foo bar"                      
[master (root-commit) 2031b47] foo bar
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 bar
$ GIT_SMART_HTTP=0 GIT_CURL_VERBOSE=1 GIT_TRACE=1 git push origin master
trace: built-in: git 'push' 'origin' 'master'
trace: run_command: 'git-remote-https' 'origin' 'https://dav.box.com/dav/foo'
* Hostname was NOT found in DNS cache
*   Trying 74.112.185.70...
* Connected to dav.box.com (74.112.185.70) port 443 (#0)
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: none
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* Server certificate:
* 	 subject: serialNumber=jde9iuVneOEaNkFotOvLFaWx0vb5-Qpv; C=US; ST=California; L=Los Altos; O=Box, Inc.; CN=*.box.com
* 	 start date: 2014-04-07 05:14:35 GMT
* 	 expire date: 2017-10-31 20:06:48 GMT
* 	 subjectAltName: dav.box.com matched
* 	 issuer: C=US; O=GeoTrust, Inc.; CN=GeoTrust SSL CA
* 	 SSL certificate verify ok.
> GET /dav/foo/info/refs HTTP/1.1
User-Agent: git/2.0.1
Host: dav.box.com
Accept: */*
Accept-Encoding: gzip
Pragma: no-cache

< HTTP/1.1 401 Unauthorized
* Server nginx is not blacklisted
< Server: nginx
< Date: Fri, 04 Jul 2014 23:34:18 GMT
< Content-Type: application/xml; charset=utf-8
< Content-Length: 242
< Connection: keep-alive
< Vary: Host
< WWW-Authenticate: Basic realm="dav.box.com"
< 
* Ignoring the response-body
* Connection #0 to host dav.box.com left intact
* Issue another request to this URL: 'https://dav.box.com/dav/foo/info/refs'
* Found bundle for host dav.box.com: 0x123ff40
* Re-using existing connection! (#0) with host dav.box.com
* Connected to dav.box.com (74.112.185.70) port 443 (#0)
* Server auth using Basic with user '[[ redacted ]]'
> GET /dav/foo/info/refs HTTP/1.1
Authorization: Basic [[ redacted ]]
User-Agent: git/2.0.1
Host: dav.box.com
Accept: */*
Accept-Encoding: gzip
Pragma: no-cache

< HTTP/1.1 200 OK
* Server nginx is not blacklisted
< Server: nginx
< Date: Fri, 04 Jul 2014 23:34:19 GMT
< Content-Type: application/octet-stream
< Content-Length: 0
< Connection: keep-alive
< Vary: Host
< Cache-control: private
< Accept-Ranges: bytes
< Content-Disposition: attachment;filename="refs";filename*=UTF-8''refs
< X-Content-Type-Options: nosniff
< Last-Modified: Fri, 04 Jul 2014 23:23:51 GMT
< ETag: "da39a3ee5e6b4b0d3255bfef95601890afd80709"
< Accept-Ranges: bytes
< 
* Connection #0 to host dav.box.com left intact
* Found bundle for host dav.box.com: 0x123ff40
* Re-using existing connection! (#0) with host dav.box.com
* Connected to dav.box.com (74.112.185.70) port 443 (#0)
* Server auth using Basic with user '[[ redacted ]]'
> GET /dav/foo/HEAD HTTP/1.1
Authorization: Basic [[ redacted ]]
User-Agent: git/2.0.1
Host: dav.box.com
Accept: */*
Accept-Encoding: gzip
Pragma: no-cache

< HTTP/1.1 200 OK
* Server nginx is not blacklisted
< Server: nginx
< Date: Fri, 04 Jul 2014 23:34:20 GMT
< Content-Type: application/octet-stream
< Content-Length: 23
< Connection: keep-alive
< Vary: Host
< Cache-control: private
< Accept-Ranges: bytes
< Content-Disposition: attachment;filename="HEAD";filename*=UTF-8''HEAD
< X-Content-Type-Options: nosniff
< Last-Modified: Fri, 04 Jul 2014 23:24:12 GMT
< ETag: "acbaef275e46a7f14c1ef456fff2c8bbe8c84724"
< Accept-Ranges: bytes
< 
* Connection #0 to host dav.box.com left intact
trace: run_command: 'http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master'
trace: exec: 'git' 'http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master'
trace: exec: 'git-http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master'
trace: run_command: 'git-http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master'
* Hostname was NOT found in DNS cache
*   Trying 74.112.184.70...
* Connected to dav.box.com (74.112.184.70) port 443 (#0)
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: none
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* Server certificate:
* 	 subject: serialNumber=jde9iuVneOEaNkFotOvLFaWx0vb5-Qpv; C=US; ST=California; L=Los Altos; O=Box, Inc.; CN=*.box.com
* 	 start date: 2014-04-07 05:14:35 GMT
* 	 expire date: 2017-10-31 20:06:48 GMT
* 	 subjectAltName: dav.box.com matched
* 	 issuer: C=US; O=GeoTrust, Inc.; CN=GeoTrust SSL CA
* 	 SSL certificate verify ok.
> PROPFIND /dav/foo/ HTTP/1.1
User-Agent: git/2.0.1
Host: dav.box.com
Accept: */*
Depth: 0
Content-Type: text/xml
Content-Length: 158
Expect: 100-continue

< HTTP/1.1 100 Continue
* We are completely uploaded and fine
< HTTP/1.1 401 Unauthorized
* Server nginx is not blacklisted
< Server: nginx
< Date: Fri, 04 Jul 2014 23:34:21 GMT
< Content-Type: application/xml; charset=utf-8
< Content-Length: 242
< Connection: keep-alive
< Vary: Host
< WWW-Authenticate: Basic realm="dav.box.com"
* the ioctl callback returned 0
< 
* Ignoring the response-body
* Connection #0 to host dav.box.com left intact
* Issue another request to this URL: 'https://dav.box.com/dav/foo/'
* Found bundle for host dav.box.com: 0x20469c0
* Re-using existing connection! (#0) with host dav.box.com
* Connected to dav.box.com (74.112.184.70) port 443 (#0)
* Server auth using Basic with user '[[ redacted ]]'
> PROPFIND /dav/foo/ HTTP/1.1
Authorization: Basic [[ redacted ]]
User-Agent: git/2.0.1
Host: dav.box.com
Accept: */*
Depth: 0
Content-Type: text/xml
Content-Length: 158
Expect: 100-continue

< HTTP/1.1 100 Continue
[[ This is where it hangs for about 60 seconds ]]
* Empty reply from server
* Connection #0 to host dav.box.com left intact
error: Cannot access URL https://dav.box.com/dav/foo/, return code 52
fatal: git-http-push failed
error: failed to push some refs to 'https://dav.box.com/dav/foo'