Ssh_exchange_identification: read: Connection reset by peer

I am on OS X trying to ssh into a ubuntu 12.04 server. I was able to SSH in -- until abruptly stuff stopped working. I've read online to use the -v to debug this. Output is shown below. If I ssh into a different box and then ssh from that box to the server I am able to login. I have no idea how to debug this problem but would like to learn.

$ ssh -v me@server

OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2021

debug1: Reading configuration data /etc/ssh_config

debug1: /etc/ssh_config line 20: Applying options for 

debug1: /etc/ssh_config line 53: Applying options for 

debug1: Connecting to server [IP] port 22.

debug1: Connection established.

debug1: identity file /Users/me/.ssh/id_rsa type 1

debug1: identity file /Users/me/.ssh/id_rsa-cert type -1

debug1: identity file /Users/me/.ssh/id_dsa type -1

debug1: identity file /Users/me/.ssh/id_dsa-cert type -1

debug1: Enabling compatibility mode for protocol 2.0

debug1: Local version string SSH-2.0-OpenSSH_6.2

ssh_exchange_identification: read: Connection reset by peer

So far (on advice of message boards) I have looked for a hosts deny file -- but there is no such file on my machine.

$ cat /etc/hosts.deny 

cat: /etc/hosts.deny: No such file or directory

I have admin access on client machine but not on server.