Oracle Linux and SSH

Hallo!
I have a MacBook Pro 64 bit Version: 10.8.5 .
I installed VirtualBox 4.3.4 on it.
I used to install Debian Guest OSs.
I used under Network 'NAT' with Port Forwarding
There I mapped the Port 22 of the Guest OS with 60xx Ports.
Then I opened the shell on my Mac and did a ssh connection for example in the following way:
ssh -p 6011 root@localhost
And it worked always fine.
Then I installed Oracle Linux6 on my VirtualBox.
And I did a Port Mapping: Port 22 on Oracle Linux with 6017 on my Mac.
When I do
ssh -p 6017 root@localhost
it comes
ssh_exchange_identification: Connection closed by remote host
I think that has anything to do with the configuration of /etc/ssh/sshd_config?!
Can anybody show me how this file should look like?
Or do I have another problem?
Thanks for any help!
Gerhard

Hi Dude!
Thanks for your comments!
I use 'bridged network adapter' if I want to connect from my 'Guest'-OS to the Internet.
In my case I want to configure my Mac with its OSes as a 'Stand-Alone' Machine
(I live in Mexiko on the Countryside and often I don't have connection to the Internet).
That means, that my Mac is my Client and my Host-Server at the same time.
I install a database on my 'Guest OS', start my 'Guest OS' and that all.
All the rest I want to do, is to access to my 'Guest OS' from my Mac.
I do all my SQL, PL/SQL and DBA stuff from Oracle SQL Developer installed on my Mac.
I work with APEX and I access to the Database installed on my OS via my Browser installed on my Mac.
And for any work on my Guest Linux OS, I do that with my Mac Shell.
I did the same for many time with my Linux Guest OSes Debian and Ubuntu.
And it worked always fine.
But I never tried it with RedHat Systems.
I compared my /etc/ssh/sshd_config of my Oracle Linux OS with /etc/ssh/sshd_config of my Debian OS.
And the configuration is very different.
So I don't think, that it is a problem of my VirtualBox Network Configuration.
If it would be a problem of my VirtualBox Network Configuration, why does it run with my Debian OSes without problems?
Thanks for any help!
Gerhard

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