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Can I restrict the number of ssh connections to my Linux box - by username or by ip or both?

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    You should probably have a more descriptive title so that people know what you are asking at a glance. – MDMarra Sep 14 '10 at 13:53
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To allow login only some users you can use AllowUsers keyword in /etc/ssh/sshd_config. To restrict a number of ssh connections You can use MaxSessions keyword.

For example:

AllowUsers jack joe
MaxSessions 5

From manual:

AllowUsers This keyword can be followed by a list of user name patterns, separated by spaces. If specified, login is allowed only for user names that match one of the patterns. Only user names are valid; a numerical user ID is not recognized. By default, login is allowed for all users. If the pattern takes the form USER@HOST then USER and HOST are separately checked, restricting logins to particular users from partic- ular hosts. The allow/deny directives are processed in the following order: DenyUsers, AllowUsers, DenyGroups, and finally AllowGroups.

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