1. Setup up SSH authentication for github(followed every step in this article)
2. Changed jenkins user to Administrator from local system
3. created ssh private and public key, also create known_hosts file
4. After creation of private and public key I was able to clone repository via cmd but still not through jenkins

Error trace :

Building in workspace C:\Users\Administrator\.jenkins\workspace\zzz
> C:\Program Files\Git\cmd\git.exe rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
> C:\Program Files\Git\cmd\git.exe config remote.origin.url https://github.com/entytle/dedupe-job.git # timeout=10
Fetching upstream changes from https://github.com/zzz/zzz-job.git
> C:\Program Files\Git\cmd\git.exe --version # timeout=10
using GIT_ASKPASS to set credentials
> C:\Program Files\Git\cmd\git.exe fetch --tags --progress https://github.com/zzz/zzz-job.git +refs/heads/:refs/remotes/origin/
ERROR: Timeout after 10 minutes
ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from https://github.com/zzz/zzz-job.git
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:806)
at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1066)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1097)
at hudson.scm.SCM.checkout(SCM.java:495)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1278)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:604)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529)
at hudson.model.Run.execute(Run.java:1728)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:404)
Caused by: hudson.plugins.git.GitException: Command "C:\Program Files\Git\cmd\git.exe fetch --tags --progress https://github.com/zzz/zzz-job.git +refs/heads/:refs/remotes/origin/" returned status code -1:
stdout:
stderr:
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1784)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1513)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:64)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:315)
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:804)
... 11 more
ERROR: null
Finished: FAILURE