Try running these commands and then start ssh (service ssh start):

rm /etc/ssh/ssh_host_*

/usr/sbin/dpkg-reconfigure openssh-server

Did you edit /etc/ssh/sshd_config?

Is OpenSSH running?

sudo ps wwaux | grep ssh

I think no: http://i.imgur.com/MHhAwfw.png
I trying: http://img4.imageshack.us/img4/4200/vlyj.png

Same problem >_

No. Today I had rebuild my droplet (Ubuntu 12.04 x32)- installed LAMP, created user, edited apache config. Few hours ago I opened and connected to droplet using putty and tried connect to droplet via SFTP (FileZilla). FilleZillla say "Network error: Connection refused" and I closed and open putty and he also say "Network error: Connection refused".

Hmm. I believe openssh logs to syslog, check if there are any errors:

sudo tail -30 /var/log/syslog

sudo tail -30 /var/log/auth.log

syslog: http://pastebin.com/yiGWPyQm
auth: http://pastebin.com/DLqHFQwF

So you have not edited anything in /etc/ssh/sshd_config? What do you have listed in the AllowUsers directive? Is the username listed, that you're attempting to log in with?

I did not open this directory never. I connect only as root