How do I improve the security of Copssh ?

Some recommendations (not all of them can be applicable in your case, no sorting by importance):

Recommendation	Benefits/Side effects	How
Change port 22 to something non-standard	Reduces your vulnerability surface dramatically by taking a well-known parameter out of equation, not applicable if you have a general purpose server. Security by obscurity ? Yes. However, there are many script kiddies out there bombing port 22 wherever they find.	Conf.file etc\sshd_config: port
Reduce the maximum number of concurrent unauthenticated con- nections	Reduces your vulnerability surface by allowing a smaller number of potentialy dangerous attacks simultaneously.	Conf.file etc\sshd_config: MaxStartups (default 10)
Turn off authentication by password. Use public key authentication instead.	Eliminates the most widely used technique of potential attacks: cracking passwords.	Conf.file etc\sshd_config: PasswordAuthentication no PubkeyAuthentication (default yes)
Restrict access by host	Use your firewall setting to limit hosts authorized for access
Restrict access by user/group		Conf.file etc\sshd_config: AllowUsers AllowGroups

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