When providing git address get a denial "The server did not respond to the 'git-ls-remote' command. Is the URL correct?" but doing ls-remote on the site gives full listing.
I have seen that message occasionally myself. I'll need some additional info to work out the details and see if we can establish a combination that works. I'll send an introductory e-mail and let me know by return e-mail what repository you were trying and in what project you'd like to enlist it and I'll see what can be done.
I'm still seeing this myself on an ordinary GitHub project. Doing the command line ls-remote works fine.
[Edit] Oops, please disregard. My bad, I had the branch wrong.