I have a private key set up in the global credentials (named sls). I have the SCM for a test project set up to download code from a springloops git project. See attached log of the failure to connect to git.

Fetching the repo with command line git works fine with the same key. If I install an SSH agent on the exact same build, it allows the fetch to work. See the other attached log for that.

I have used jenkins and git in a different environment with no problems. The only difference I've noticed here is the non-standard port of 1234. Is it possible git plugin is not identifying the port?

Setting the priority to major since use of SSH agent is a workaround but requires extra configuration and build overhead.