[racket-dev] unable to git fetch, or ssh -v to git.racket-lang.org ?

This... doesn't look like something on my end?

oiseau:~/git-clements clements> ssh -v pltgit
OpenSSH_5.6p1, OpenSSL 0.9.8y 5 Feb 2013
debug1: Reading configuration data /Users/clements/.ssh/config
debug1: Applying options for pltgit
debug1: Reading configuration data /etc/ssh_config
debug1: Applying options for *
debug1: Connecting to git.racket-lang.org [129.10.115.117] port 22.
debug1: Connection established.
debug1: identity file /Users/clements/.ssh/id_rsa type 1
debug1: identity file /Users/clements/.ssh/id_rsa-cert type -1
debug1: identity file /Users/clements/.ssh/id_rsa_plt-git type -1
debug1: identity file /Users/clements/.ssh/id_rsa_plt-git-cert type -1
debug1: identity file /Users/clements/.ssh/id_rsa_plt-git type -1
debug1: identity file /Users/clements/.ssh/id_rsa_plt-git-cert type -1
ssh_exchange_identification: Connection closed by remote host
oiseau:~/git-clements clements> git fetch
ssh_exchange_identification: Connection closed by remote host
fatal: The remote end hung up unexpectedly