Before, that commands has worked fine ..

Now we have this error : 

ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from git@bitbucket.org:mycompany/license_packs.git
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:888)
at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1155)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1186)
at hudson.scm.SCM.checkout(SCM.java:495)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1202)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:574)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
at hudson.model.Run.execute(Run.java:1724)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:421)
Caused by: hudson.plugins.git.GitException: Command "git fetch --tags --progress git@bitbucket.org:mycompany/license_packs.git +refs/heads/:refs/remotes/origin/" returned status code 128:
stdout:
stderr: ssh: connect to host bitbucket.org port 22: Network is unreachable
fatal: Could not read from remote repository.

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

at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2016)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1735)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:72)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:420)
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:886)
... 11 more
ERROR: Error fetching remote repo 'origin'