If you have ever tried setting up git as a version control system in a Jenkins installation on a windows box you would have faced an error message ssh key not available.
The reason behind this issue is that if you are using git with ssh protocol it tries to use your private key to perform git operations over ssh protocol & the location it expects is the .ssh folder at home directory of user. To fix this issue you have to create a HOME environment variable and point to your home directory where your .ssh folder exists after that restart Jenkins & now it should work fine.
DEVOPS DONE RIGHT 