Gitlab-co-multi-runner Error message

I have two different machines. One is running GitLab Enterprise Edition 8.4.3-ee, and the other is a Windows 7 machine. I have a batch file that I want to run on the Windows machine whenever someone pushes or merges a file into the ‘develop’ branch.

Everything seems to trigger when it should, but the build fails with this message…

gitlab-ci-multi-runner 1.0.2 (ea19241)
Using SSH executor...

ERROR: Build failed with: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

On the Windows machine, the SSH server is freeSSHd version 1.3.1.

Is what I am attempting even possible?

Thanks,
-Christian

I wish someone from gitlab would respond to this issue, there are other similar ssh runner issues that no one is answering. Support asked me to turn on debug. That did not help.