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I have some users, who connect to my server through the ssh for port forwarding and ssh tunneling, but there is a problem: I cannot limit their concurrent logins, because they have no session and cannot access to any shell. In this case, PAM and Limits file, wont help.

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According to OpenSSH FAQ you could use PAM for ssh authentication.

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"Use Pam" option on ssh configuration file is enabled, But It won't help cause in port forwarding mode, i disabled their access to Shell, and Pam's do nothing. – kouche Jun 8 '11 at 5:19
Do you have anything in pam configuration for ssh (/etc/pam.d/sshd)? – AlexD Jun 8 '11 at 15:48
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