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.

What happens when another user tries to log in? Is it really a Ubuntu **Server** (without GUI)? — Melebius, Feb 06 '17 at 08:14
no there is a GUI (thats why i setup the Xfce) , when 10 users login the eleventh login failes. — S.Ghanim, Feb 06 '17 at 08:22
Add 'MaxSessions 50' to the '/etc/ssh/ssh_config' file that should fix it — George Udosen, Feb 06 '17 at 08:45
Please sorry the change should have been in `/etc/ssh/sshd_config` NOT `/etc/ssh/ssh_config`. My apologies! — George Udosen, Feb 06 '17 at 11:00

George Udosen · Answer 1 · 2017-02-06T10:56:21.433

7

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).

edited Feb 06 '17 at 10:56

answered Feb 06 '17 at 08:51

George Udosen

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unfortunately this didn't solve it. – S.Ghanim Feb 06 '17 at 09:53
@Melebius, thanks was accessing from my mobile at the time :). – George Udosen Feb 06 '17 at 10:57
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. – S.Ghanim Feb 06 '17 at 11:16
@S.Ghanim you should [accept his answer](http://askubuntu.com/help/accepted-answer) instead of posting "thanks" as a separate answer. – muru Feb 06 '17 at 11:20
@muru it is not the answer to my question, however I thanked him for the clue he gave, so whats wrong with this!!!!!! – S.Ghanim Feb 06 '17 at 11:42
@S.Ghanim ah, I didn't notice you edited a different file. – muru Feb 06 '17 at 11:44

score 5 · Accepted Answer · edited Apr 13 '17 at 12:24

5

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.

edited Apr 13 '17 at 12:24

Community

1

answered Feb 06 '17 at 11:14

S.Ghanim

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1
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Can you please tell me how you managed to setup ubuntu server to host 50 users or so from scratch, pls?! – Samy Mohsen Jan 11 '23 at 04:33

Ubuntu Server, multiple simultaneous remote users

2 Answers2