It seems that http://mapevent.azurewebsites.net/ doesn't need a proxy. It is part of the remote origin url which you want to clone, but the page "How to Deploy an Azure Web Site" doesn't mention "proxy" at all. Not does the page using Git.
So make sure to remove the proxy, and try to clone:
git config --global --unset-all http.proxy
If you were to need a proxy to access to internet, you should already have HTTP_PROXY
(and HTTPS_PROXY
) environment variables in place (as I mention in "could not resolve host github.com
error while cloning remote repository in git").
But that proxy url (should you actually use one) would certainly not be '<username>:<password>@mapevent.azurewebsites.net:443
': that is part of the url you want to clone.