Configure GitLab repository in Jenkins

I'm trying to configure Jenkins (running on Windows Server 2008) to connect to a GitLab 6.0 repository (on a linux box).

From my local windows box I can use the SSH URLs to clone the projects on my GitLab server. I've had some issues using the HTTP URLs, but I did manage to connect using HTTP with authentication using the Eclipse plugin.

On the Jenkins project config screen I have attempted:

http://myserver.domain/mygroup/myproject.git

Failed to connect to repository :

Command "d:\tools\Git\bin\git.exe ls-remote -h http://myserver.domain/mygroup/myproject.git HEAD"

returned status code 128:

stdout: stderr: error: The requested URL returned error: 504 while accessing

http://myserver.domain/mygroup/myproject.git/info/refs?service=git-upload-pack

fatal: HTTP request failed

When I try this URL in a browser I get an authentication popup. If I enter my email & password I can successfully download the list of branches & tags.

...Okay, so I should be able to specify the username & password in the URL, right?

http://username:password@myserver.domain/mygroup/myproject.git

...nope:

http://username:password@myserver.domain/mygroup/myproject.git/info/refs not valid: is this a git repository?

The Windows GUIs didn't have any trouble using SSH.
...Jenkins doesn't seem to like that much though:

git@myserver.domain:mygroup/myproject.git

The error "Please enter Git repository" still remains, and when I attempt to save the config I see the following stack trace:

Exception: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.git.GitSCM from 
{"value":"2",
 "userRemoteConfigs":     
   {"url":"git@myserver.domain:mygroup/myproject.git",
    "name":"origin","refspec":""
   },
 "branches":{"name":""},
 "includedRegions":"","excludedRegions":"","excludedUsers":"",
 "localBranch":"","relativeTargetDir":"","reference":"",
 "scmName":"",
 "gitConfigName":"","gitConfigEmail":"",
 "pruneBranches":false,"skipTag":false,"clean":false,"remotePoll":false,
 "disableSubmodules":false,"recursiveSubmodules":false,
 "authorOrCommitter":false,"wipeOutWorkspace":false,"ignoreNotifyCommit":false,
 "useShallowClone":false,"":["","0"],
 "gitTool":"Default",
 "browser":{"stapler- class":"hudson.plugins.git.browser.FisheyeGitRepositoryBrowser"}

Stacktrace:
javax.servlet.ServletException: 
java.lang.RuntimeException: Failed to instantiate class hudson.plugins.git.GitSCM from {...}
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:725)
...
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.git.GitSCM from {...}
  at hudson.model.Descriptor.newInstance(Descriptor.java:617)
  ...
Caused by: java.lang.NullPointerException
  at hudson.scm.RepositoryBrowser.normalizeToEndWithSlash(RepositoryBrowser.java:85)
  at hudson.plugins.git.browser.FisheyeGitRepositoryBrowser.<init>(FisheyeGitRepositoryBrowser.java:37)

I tried adding the "ssh" protocol:

ssh://git@myserver.domain:mygroup/myproject.git

Jenkins immediately reacts:

stderr: ssh: myserver.domain:mygroup: no address associated with name

fatal: Could not read from remote repository.

Please make sure you have the correct access rights and the repository exists.

As I commented:

Maybe Jenkins doesn't support the scp syntax (with ':') Try

 ssh://git@myserver.domain/mygroup/myproject.git

As mentioned in ".ssh config with amazon ec2 and git", using ':' usually involves a ~/.ssh/config file, which resolves the string preceding the ':' into a server, user, port and ssh key.

Jenkins might understand better git@myserver.domain/mygroup/myproject.git instead of git@myserver.domain:mygroup/myproject.git.