Error in Jenkins connection to stash
I know its a little late but this worked for me:
Check if you have install git on the Jenkins server, and check if you have set the git executable path in the Jenkins configuration
More specifically go to 'Manage Jenkins' -> 'Global Tool Configuration' and check the 'Path to Git executable' field.
In Global Tool Configuration, where you "set" GIT location:C:/Program Files (x86)/Git/bin/git.exe. Do not forget to include ‘.exe’ extension.It is for Windows.
We had to downgrade to git plugin version 1.5.0 and git client plugin version 1.0.7 and it worked. We are running Jenkins version 1.577.
That git plugin takes the url as: https://jenkinuser:password@lab.xyz.com/stash/scm/projects/sandbox.git