Number of Connections in Linux/Unix

Hi  Team,

I need to know how many terminals a user can open in a Linux server. For example as user sam, how many terminals can I open? is there a limit on the no connections to be allowed in Linux server.
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Dr. KlahnPrincipal Software EngineerCommented:
For SSH, you can usually open as many as you like (but sooner or later it will fail for lack of some resource.)  Limits can be placed on the number of pseudo-TTYs but (a) this is not often done and (b) it doesn't work quite the way it "obviously" should.

For physical terminals there will be physical limits due to the number of serial ports.

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nociSoftware EngineerCommented:
For sshd in /etc/ssh/sshd_config   the MaxSession parameter definces the number of logins for a user.
10 by default.
Other subsystems can have other limits.  (like previous answer depending on f.e. physical limits.)
iptables can enforce the max. number of connections from a single address iptables -m connlimit --connlimit X
sam_2012Author Commented:
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