The remote end hung up unexpectedly

$ git push ssh://user@host.xz:~/path/to/repo.git master
ssh: Could not resolve hostname host.xz:~: Name or service not known
fatal: The remote end hung up unexpectedly
$ git push user@host.xz:~/path/to/repo.git master
Everything up-to-date

詳細不明

参考
http://www.kernel.org/pub/software/scm/git/docs/git-push.html