The URL you entered is not a valid URL, at least as far as I understand URL's. Your URL was
https://sai...@git.37degrees.us:/37DRepo. I think you want the URL to be
https://sai...@git.37degrees.us/37DRepo . The extra ":" is probably parsed as a separator that precedes a port number, but then you did not provide a port number.
It is rather uncommon (though allowed) to embed the user name in the URL. You can do it, but you can also define a Jenkins credential which provides user name and password, then use that credential with a URL like
https://git.37degrees.us/37DRepo .
Mark Waite