Ubuntu Server, multiple simultaneous remote users

Question

I'm setting up a new Ubuntu Server (16.04) to which up to 50 people will have access at the same time. I've followed this tutorial to setup the XRDP with the xfce and every thing is fine so far, the problem is that only 10 users can be logged in at the same time. can anyone help about that. thank you.

Solution 1

I've figured out the solution, I've increased the MaxSessions in the /etc/xrdp/sesman.ini file.

thank you George your answer served as a great clue.

Solution 2

You need to need to increase the default allowed connection using the

/etc/ssh/sshd_config

File, add the lines

MaxSessions 50
MaxStartups 50:30:100

to that file. Then restart you system.

Form man sshd_config(5):

MaxSessions
         Specifies the maximum number of open shell, login or subsystem
         (e.g. sftp) sessions permitted per network connection.  Multiple
         sessions may be established by clients that support connection
         multiplexing.  Setting MaxSessions to 1 will effectively disable
         session multiplexing, whereas setting it to 0 will prevent all
         shell, login and subsystem sessions while still permitting for-
         warding.  The default is 10.

 MaxStartups
         Specifies the maximum number of concurrent unauthenticated con-
         nections to the SSH daemon.  Additional connections will be
         dropped until authentication succeeds or the LoginGraceTime
         expires for a connection.  The default is 10:30:100.

         Alternatively, random early drop can be enabled by specifying the
         three colon separated values ``start:rate:full'' (e.g.
         "10:30:60").  sshd(8) will refuse connection attempts with a
         probability of ``rate/100'' (30%) if there are currently
         ``start'' (10) unauthenticated connections.  The probability
         increases linearly and all connection attempts are refused if the
         number of unauthenticated connections reaches ``full'' (60).

Comments

[Melebius]

What happens when another user tries to log in? Is it really a Ubuntu Server (without GUI)?

[S.Ghanim]

no there is a GUI (thats why i setup the Xfce) , when 10 users login the eleventh login failes.

[George Udosen]

Add 'MaxSessions 50' to the '/etc/ssh/ssh_config' file that should fix it

[George Udosen]

Please see my updated answer.

[George Udosen]

Please sorry the change should have been in /etc/ssh/sshd_config NOT /etc/ssh/ssh_config. My apologies!

[S.Ghanim]

unfortunately this didn't solve it.

[George Udosen]

@Melebius, thanks was accessing from my mobile at the time :).

[S.Ghanim]

I've figured out the solution, I've increased the MaxSessions in the /etc/xrdp/sesman.ini file. thank you @George your answer served as a great clue.

[muru]

@S.Ghanim you should accept his answer instead of posting "thanks" as a separate answer.

[S.Ghanim]

@muru it is not the answer to my question, however I thanked him for the clue he gave, so whats wrong with this!!!!!!

[muru]

@S.Ghanim ah, I didn't notice you edited a different file.