MaxSessions in sshd_config not limiting sessions

plisken · 07-08-2014, 02:10 AM

I'm having trouble limiting the njhumber of concurrent ssh connections, now I don't know if this is something new or not, I seem to recall being here before, but regardless, I have the MaxSessions set to 3 in my sshd_config file and note from the man page:

Code:

MaxSessions
             Specifies the maximum number of open sessions permitted per net-
             work connection.  The default is 10.

But I seem to be able to connect as many times as I like, see my log entries below.

Code:

Jul  8 08:03:04 orion sshd[21107]: Accepted password for myuser from 81.137.xxx.xx port 57428 ssh2
Jul  8 08:03:16 orion sshd[21180]: Accepted password for myuser from 81.137.xxx.xx port 57429 ssh2
Jul  8 08:03:26 orion sshd[21253]: Accepted password for myuser from 81.137.xxx.xx port 57430 ssh2
Jul  8 08:03:36 orion sshd[21326]: Accepted password for myuser from 81.137.xxx.xx port 57431 ssh2
Jul  8 08:03:45 orion sshd[21399]: Accepted password for myuser from 81.137.xxx.xx port 57439 ssh2
Jul  8 08:03:54 orion sshd[21472]: Accepted password for myuser from 81.137.xxx.xx port 57440 ssh2

Note: I do have the MaxStartups set which is working as expected

Any suggestions?

Running Slack 14 64 with
OpenSSH_6.6.1p1, OpenSSL 1.0.1h 5 Jun 2014

Thanks in advance...

evo2 · 07-08-2014, 03:48 AM

Hi,

short answer: this is not what the MaxSessions directive is supposed to limit. It is related to lower level networking IIRC. Sorry I don't have the reference at hand right now.

Evo2.