Check out from VCS Git (not GitHub) Fails, works at command line

I am attempting to "Check out Project from VCS." It is a Git (not GitHub) project hosted on my local network. I am able to, at the command line, clone the project with `git clone ssh://username@gitserver:/path/to/repository.git` However, from within Webstorm, with the field "Git Repository URL" set to `ssh://username@gitserver:/path/to/repository.git` it fails with message, "Could not read from remote repository." It doesn't even ask me for a password. 

I don't know what Webstorm is doing that is different than what I do at the command line. What could be interfering here? What additional info can I post that would be helpful?