How do I prevent unauthorized ssh login attempts?

[Duane Hill]

On Thu, 26 Apr 2007, Pietro Cerutti wrote:

> On 4/26/07, Andreas Widerøe Andersen <wodfer at gmail.com> wrote:
>> On 4/26/07, Arek Czereszewski <arekczer at gmail.com> wrote:
>> >
>> > Andreas Widerøe Andersen wrote:
>> > > I'm getting a lot of unauthorized ssh login attempts. I have a pretty
>> > basic
>> > > FreeBSD 6.2 setup. I have compiled my own kernel. Here's what I get 
> from
>> > my
>> > > daily security run output:
>> > [...]
>> >
>> > Run sshd on other port.
>> > And say about this your ssh users.
>>
>>
>> Can I change the ssh port on a live server somehow without getting locked
>> out? The server is on a remote co-location a flight away from me.
>
> Yes you can. SSH will keep your connection active until you log out,
> then you can log in using the new port

I will add the fact you will want to keep the current connection live and 
test after you make the change with a new connection. That way if the new 
connection fails, you still have a "foot in the door".