I don't can login in PuTTy i get that message: "Network error: Connection refused"

I installed LAMP in Ubuntu 14.04 32bits with one click system DigitalOcean, all working fine I go to that video official of DigitalOcean to set up more security to my server:

But I perceive everytime when I to do the settings in /etc/ssh/sshd_config I disable my login in PuTTY!

And when I try login in PuTTY i receive: “Network error: Connection refused”

Please help me!!! I don’t can’t login in PUTTY!!! I have no more access!!!

How can I fix it? How can I settup that changes for security but without stay with that erro message?

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