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sancho.s ReinstateMonicaCellio
Asked: 2021-11-04 03:10:04 +0800 CST

xRDP connection failed: login failed for display 0 + rejection

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I will update info as I find out

The problem

I am using a recently installed Lubuntu 20.04.3, in an old PC. I mean to connect via xRDP from both Ubuntu (remmina) and Windows 10 PCs, and so far I cannot from either.

What I see when connecting from Ubuntu 20.04.3, remmina:

  1. Screen 1 with the message login failed for display 0.
    From logs below, I understand this is just a warning, but then an attempt to connect with display 10 (or display 11 if there is already an X connection using display 10) is successful.
    So I would only later bother about how to remove this initial attempt with display 0, or how to make it succeed.
  2. Screen 2 with the login prompt.
  3. A brief black screen, and then the connection window closes.

enter image description here enter image description here

How can I fix this?

Note: I don't think there is a problem with username/password. There are no special characters, nor capital letters in either. And I can ssh to that server with no problem from both Ubuntu and Win 10. Plus, logs below suggest this is ok.

What I tried so far

See below for specific info; none of this changed the outcome:

  1. Installed required packages: xrdp xorgxrdp xserver-xorg-core xserver-xorg-input-all

  2. Enabled the service.

  3. Added two lines in /etc/xrdp/startwm.sh as shown under Fix Black Ubuntu Screen. Restaring the service.

  4. Removed an issue with certifcates (Option 2 here), with sudo adduser xrdp ssl-cert Restaring the service. Upon connecting again, remmina asked me to accept certificates, which I did.

  5. Edited /etc/X11/Xwrapper.config as shown here. Restaring the service.

  6. Given the error message in ~/.xorgxrdp.11.log (failed to take device: Operation not permitted) and this solved similar problem (although not with xrdp), I tried enabling KMS (I learned radeon is the driver) with

    $ sudo nano /etc/initram-tools/modules
(adding radeon at the end)
$ sudo update-initramfs -u
$ sudo shutdown -r

  7. Logging out in the server and remote-connecting, as per this.

I am not sure about a few points:

  1. Could the problem be related to the fact I am using Gnome in the client, and another WM in the server? If it could, how can I confirm or rule out this? How can I solve this? See below.
  2. Could the problem be related to the first attempt at using display 0? If so, how could I remove that initial attempt, and use the available display (10, 11, etc.) in the first attempt?
  3. Do I need any UFW rule, given I am at home, with all PCs connected to the same router? If so, which are the commands to set the rule/s?
  4. Should I modify /etc/xrdp/xrdp.ini as shown here?
  5. Is the excerpt from ~/.xsession-errors below indicative of what to try next? If so, what are the commands that should follow?
  6. Is line [ERROR] g_tcp_bind(9, 6010) failed bind IPv6 (errno=98) and IPv4 (errno=22) the key for the solution? If so, what are the commands that should follow?
  7. Can I do this without a VNC server? (I would keep the demand on my server as low as possible, it is an old PC). This and this mention the VNC server as a requirement.

Specific info

On firewall

$ sudo ufw status verbose
Status: inactive

On packages

$ dpkg -l | grep xrdp
ii  xorgxrdp                      1:0.2.12-1                    amd64   Remote Desktop Protocol (RDP) modules for X.org
ii  xrdp                          0.9.12-1                      amd64   Remote Desktop Protocol (RDP) server
$ dpkg -l | grep xserver
ii  x11-xserver-utils             7.7+8                         amd64   X server utilities
ii  xserver-common                2:1.20.11-1ubuntu1~20.04.2    all     common files used by various X servers
ii  xserver-xorg                  1:7.7+19ubuntu14              amd64   X.Org X server
ii  xserver-xorg-core             2:1.20.11-1ubuntu1~20.04.2    amd64   Xorg X server - core server
ii  xserver-xorg-input-all        1:7.7+19ubuntu14              amd64   X.Org X server -- input driver metapackage
ii  xserver-xorg-input-libinput   0.29.0-1                      amd64   X.Org X server -- libinput input driver
ii  xserver-xorg-input-wacom      1:0.39.0-0ubuntu1             amd64   X.Org X server -- Wacom input driver
ii  xserver-xorg-legacy           2:1.20.11-1ubuntu1~20.04.2    amd64   setuid root Xorg server wrapper
ii  xserver-xorg-video-all        1:7.7+19ubuntu14              amd64   X.Org X server -- output driver metapackage
ii  xserver-xorg-video-amdgpu     19.1.0-1                      amd64   X.Org X server -- AMDGPU display driver
ii  xserver-xorg-video-ati        1:19.1.0-1                    amd64   X.Org X server -- AMD/ATI display driver wrapper
ii  xserver-xorg-video-fbdev      1:0.5.0-1ubuntu1              amd64   X.Org X server -- fbdev display driver
ii  xserver-xorg-video-intel      2:2.99.917+git20200226-1      amd64   X.Org X server -- Intel i8xx, i9xx display driver
ii  xserver-xorg-video-nouveau    1:1.0.16-1                    amd64   X.Org X server -- Nouveau display driver
ii  xserver-xorg-video-qxl        0.1.5+git20200331-1           amd64   X.Org X server -- QXL display driver
ii  xserver-xorg-video-radeon     1:19.1.0-1                    amd64   X.Org X server -- AMD/ATI Radeon display driver
ii  xserver-xorg-video-vesa       1:2.4.0-2                     amd64   X.Org X server -- VESA display driver
ii  xserver-xorg-video-vmware     1:13.3.0-3                    amd64   X.Org X server -- VMware display driver

On the service (at the time of writing)

$ sudo systemctl status xrdp
[sudo] password for user1: 
● xrdp.service - xrdp daemon
     Loaded: loaded (/lib/systemd/system/xrdp.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2021-11-03 07:17:27 -03; 46min ago
       Docs: man:xrdp(8)
             man:xrdp.ini(5)
    Process: 794 ExecStartPre=/bin/sh /usr/share/xrdp/socksetup (code=exited, status=0/SUCCESS)
    Process: 809 ExecStart=/usr/sbin/xrdp $XRDP_OPTIONS (code=exited, status=0/SUCCESS)
   Main PID: 821 (xrdp)
      Tasks: 2 (limit: 4114)
     Memory: 13.6M
     CGroup: /system.slice/xrdp.service
             ├─ 821 /usr/sbin/xrdp
             └─2270 /usr/sbin/xrdp

nov 03 07:51:49 server1 xrdp[2270]: (2270)(140250390095680)[DEBUG] xrdp_000008de_wm_login_mode_event_00000001
nov 03 07:51:49 server1 xrdp[2270]: (2270)(140250390095680)[INFO ] Loading keymap file /etc/xrdp/km-0000080a.ini
nov 03 07:51:49 server1 xrdp[2270]: (2270)(140250390095680)[WARN ] local keymap file for 0x0000080a found and doesn't match built in keym>
nov 03 07:51:50 server1 xrdp[2270]: (2270)(140250390095680)[DEBUG] xrdp_wm_log_msg: connecting to sesman ip 127.0.0.1 port 3350
nov 03 07:51:50 server1 xrdp[2270]: (2270)(140250390095680)[INFO ] xrdp_wm_log_msg: sesman connect ok
nov 03 07:51:50 server1 xrdp[2270]: (2270)(140250390095680)[DEBUG] xrdp_wm_log_msg: sending login info to session manager, please wait...
nov 03 07:51:50 server1 xrdp[2270]: (2270)(140250390095680)[DEBUG] return value from xrdp_mm_connect 0
nov 03 07:51:52 server1 xrdp[2270]: (2270)(140250390095680)[INFO ] xrdp_wm_log_msg: login failed for display 0
nov 03 07:51:52 server1 xrdp[2270]: (2270)(140250390095680)[DEBUG] xrdp_mm_module_cleanup
nov 03 07:51:52 server1 xrdp[2270]: (2270)(140250390095680)[DEBUG] Closed socket 16 (AF_INET6 ::1 port 33602)

On the last 2 connection attempts (at the time of writing), via tail -100 /var/log/xrdp.log. Note that the log for the second to last is much briefer (I wouldn't know why).

[20211103-08:12:23] [DEBUG] xrdp_wm_log_msg: connecting to sesman ip 127.0.0.1 port 3350
[20211103-08:12:23] [INFO ] xrdp_wm_log_msg: sesman connect ok
[20211103-08:12:23] [DEBUG] xrdp_wm_log_msg: sending login info to session manager, please wait...
[20211103-08:12:23] [DEBUG] return value from xrdp_mm_connect 0
[20211103-08:12:24] [INFO ] xrdp_wm_log_msg: login successful for display 11
[20211103-08:12:24] [DEBUG] xrdp_wm_log_msg: started connecting
[20211103-08:12:25] [INFO ] lib_mod_log_peer: xrdp_pid=2270 connected to X11rdp_pid=2309 X11rdp_uid=1000 X11rdp_gid=1001 client_ip=::ffff:192.168.0.139 client_port=42290
[20211103-08:12:25] [DEBUG] xrdp_wm_log_msg: connected ok
[20211103-08:12:25] [DEBUG] xrdp_mm_connect_chansrv: chansrv connect successful
[20211103-08:12:25] [DEBUG] Closed socket 16 (AF_INET6 ::1 port 33604)
[20211103-08:12:27] [DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.0.176 port 3389)
[20211103-08:12:27] [DEBUG] xrdp_mm_module_cleanup
[20211103-08:12:27] [DEBUG] Closed socket 17 (AF_UNIX)
[20211103-08:12:27] [DEBUG] Closed socket 18 (AF_UNIX)
[20211103-08:20:06] [DEBUG] Closed socket 11 (AF_INET6 :: port 3389)
[20211103-08:20:06] [INFO ] address [0.0.0.0] port [3389] mode 1
[20211103-08:20:06] [INFO ] listening to port 3389 on 0.0.0.0
[20211103-08:20:06] [INFO ] xrdp_listen_pp done
[20211103-08:20:07] [DEBUG] Closed socket 7 (AF_INET6 :: port 3389)
[20211103-08:20:09] [INFO ] starting xrdp with pid 2430
[20211103-08:20:09] [INFO ] address [0.0.0.0] port [3389] mode 1
[20211103-08:20:09] [INFO ] listening to port 3389 on 0.0.0.0
[20211103-08:20:09] [INFO ] xrdp_listen_pp done
[20211103-08:20:34] [INFO ] Socket 12: AF_INET6 connection received from ::ffff:192.168.0.139 port 42446
[20211103-08:20:34] [DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.0.176 port 3389)
[20211103-08:20:34] [DEBUG] Closed socket 11 (AF_INET6 :: port 3389)
[20211103-08:20:34] [INFO ] Using default X.509 certificate: /etc/xrdp/cert.pem
[20211103-08:20:34] [INFO ] Using default X.509 key file: /etc/xrdp/key.pem
[20211103-08:20:34] [DEBUG] TLSv1.3 enabled
[20211103-08:20:34] [DEBUG] TLSv1.2 enabled
[20211103-08:20:34] [DEBUG] Security layer: requested 3, selected 1
[20211103-08:20:40] [INFO ] connected client computer name: ViaLactea
[20211103-08:20:40] [INFO ] adding channel item name rdpdr chan_id 1004 flags 0xc0800000
[20211103-08:20:40] [INFO ] adding channel item name rdpsnd chan_id 1005 flags 0xc0000000
[20211103-08:20:40] [INFO ] adding channel item name cliprdr chan_id 1006 flags 0xc0a00000
[20211103-08:20:40] [INFO ] adding channel item name drdynvc chan_id 1007 flags 0xc0800000
[20211103-08:20:41] [INFO ] TLS connection established from ::ffff:192.168.0.139 port 42446: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384
[20211103-08:20:41] [DEBUG] xrdp_0000097f_wm_login_mode_event_00000001
[20211103-08:20:41] [INFO ] Loading keymap file /etc/xrdp/km-0000080a.ini
[20211103-08:20:41] [WARN ] local keymap file for 0x0000080a found and doesn't match built in keymap, using local keymap file
[20211103-08:20:41] [DEBUG] xrdp_wm_log_msg: connecting to sesman ip 127.0.0.1 port 3350
[20211103-08:20:42] [INFO ] xrdp_wm_log_msg: sesman connect ok
[20211103-08:20:42] [DEBUG] xrdp_wm_log_msg: sending login info to session manager, please wait...
[20211103-08:20:42] [DEBUG] return value from xrdp_mm_connect 0
[20211103-08:20:43] [INFO ] xrdp_wm_log_msg: login failed for display 0
[20211103-08:20:43] [DEBUG] xrdp_mm_module_cleanup
[20211103-08:20:43] [DEBUG] Closed socket 18 (AF_INET6 ::1 port 33606)
[20211103-08:20:52] [DEBUG] xrdp_wm_log_msg: connecting to sesman ip 127.0.0.1 port 3350
[20211103-08:20:52] [INFO ] xrdp_wm_log_msg: sesman connect ok
[20211103-08:20:52] [DEBUG] xrdp_wm_log_msg: sending login info to session manager, please wait...
[20211103-08:20:52] [DEBUG] return value from xrdp_mm_connect 0
[20211103-08:20:53] [INFO ] xrdp_wm_log_msg: login successful for display 11
[20211103-08:20:53] [DEBUG] xrdp_wm_log_msg: started connecting
[20211103-08:20:53] [INFO ] lib_mod_log_peer: xrdp_pid=2431 connected to X11rdp_pid=2434 X11rdp_uid=1000 X11rdp_gid=1001 client_ip=::ffff:192.168.0.139 client_port=42446
[20211103-08:20:53] [DEBUG] xrdp_wm_log_msg: connected ok
[20211103-08:20:54] [DEBUG] xrdp_mm_connect_chansrv: chansrv connect successful
[20211103-08:20:54] [DEBUG] Closed socket 18 (AF_INET6 ::1 port 33608)
[20211103-08:20:55] [DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.0.176 port 3389)
[20211103-08:20:55] [DEBUG] xrdp_mm_module_cleanup
[20211103-08:20:55] [DEBUG] Closed socket 19 (AF_UNIX)
[20211103-08:20:55] [DEBUG] Closed socket 20 (AF_UNIX)

On the last connection attempt (at the time of writing), via tail -200 /var/log/xrdp-sesman.log. Note that ... created session (access granted): username user1... suggests username/password are ok.

[20211103-08:20:06] [INFO ] shutting down sesman 1
[20211103-08:20:06] [DEBUG] Closed socket 7 (AF_INET6 ::1 port 3350)
[20211103-08:20:06] [DEBUG] libscp initialized
[20211103-08:20:06] [DEBUG] Testing if xrdp-sesman can listen on 127.0.0.1 port 3350.
[20211103-08:20:06] [DEBUG] Closed socket 5 (AF_INET6 ::1 port 3350)
[20211103-08:20:06] [INFO ] starting xrdp-sesman with pid 2420
[20211103-08:20:06] [INFO ] listening to port 3350 on 127.0.0.1
[20211103-08:20:41] [INFO ] A connection received from ::1 port 33606
[20211103-08:20:43] [DEBUG] Closed socket 8 (AF_INET6 ::1 port 3350)
[20211103-08:20:52] [INFO ] A connection received from ::1 port 33608
[20211103-08:20:52] [INFO ] ++ created session (access granted): username user1, ip ::ffff:192.168.0.139:42446 - socket: 12
[20211103-08:20:52] [INFO ] starting Xorg session...
[20211103-08:20:52] [DEBUG] Closed socket 9 (AF_INET6 :: port 5910)
[20211103-08:20:52] [ERROR] g_tcp_bind(9, 6010) failed bind IPv6 (errno=98) and IPv4 (errno=22).
[20211103-08:20:52] [DEBUG] Closed socket 9 (AF_INET6 :: port 0)
[20211103-08:20:52] [DEBUG] Closed socket 9 (AF_INET6 :: port 5911)
[20211103-08:20:52] [DEBUG] Closed socket 9 (AF_INET6 :: port 6011)
[20211103-08:20:52] [DEBUG] Closed socket 9 (AF_INET6 :: port 6211)
[20211103-08:20:53] [DEBUG] Closed socket 8 (AF_INET6 ::1 port 3350)
[20211103-08:20:53] [INFO ] calling auth_start_session from pid 2432
[20211103-08:20:53] [DEBUG] Closed socket 7 (AF_INET6 ::1 port 3350)
[20211103-08:20:53] [DEBUG] Closed socket 8 (AF_INET6 ::1 port 3350)
[20211103-08:20:53] [INFO ] /usr/lib/xorg/Xorg :11 -auth .Xauthority -config xrdp/xorg.conf -noreset -nolisten tcp -logfile .xorgxrdp.%s.log  
[20211103-08:20:53] [CORE ] waiting for window manager (pid 2433) to exit
[20211103-08:20:55] [CORE ] window manager (pid 2433) did exit, cleaning up session
[20211103-08:20:55] [INFO ] calling auth_stop_session and auth_end from pid 2432
[20211103-08:20:55] [DEBUG] cleanup_sockets:
[20211103-08:20:55] [DEBUG] cleanup_sockets: deleting /run/xrdp/sockdir/xrdp_chansrv_audio_out_socket_11
[20211103-08:20:55] [DEBUG] cleanup_sockets: deleting /run/xrdp/sockdir/xrdp_chansrv_audio_in_socket_11
[20211103-08:20:55] [DEBUG] cleanup_sockets: deleting /run/xrdp/sockdir/xrdpapi_11
[20211103-08:20:55] [INFO ] ++ terminated session:  username user1, display :11.0, session_pid 2432, ip ::ffff:192.168.0.139:42446 - socket: 12

On the Window Manager.

  1. From a graphical terminal at the server.

     $ wmctrl -m
 Name: Openbox
 Class:
 PID: N/A
 Window manager's "showing the desktop" mode: OFF

  2. From a graphical terminal at an ssh-logged client.

     $ wmctrl -m
 Name: GNOME Shell
 Class: N/A
 PID: N/A
 Window manager's "showing the desktop" mode: OFF

Excerpt from ~/.xsession-errors (at the time of writing)

Xsession: X session started for user1 at mié 03 nov 2021 10:33:01 -03
dbus-update-activation-environment: systemd --user not found, ignoring --systemd argument
dbus-update-activation-environment: setting DISPLAY=:11.0
localuser:user1 being added to access control list
dbus-update-activation-environment: systemd --user not found, ignoring --systemd argument
dbus-update-activation-environment: setting QT_ACCESSIBILITY=1
dbus-update-activation-environment: systemd --user not found, ignoring --systemd argument
dbus-update-activation-environment: setting USER=user1

Excerpt from ~/.xorgxrdp.11.log (at the time of writing, checked based on this)

[ 10692.409] (EE) systemd-logind: failed to take device /dev/dri/card0: Operation not permitted
[ 10692.409] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied

Related

  1. https://aguslr.com/blog/2017/04/15/debian-thinclient.html
  2. https://thunderboltlaptop.com/install-xrdp-ubuntu/
  3. Openbox vs. LXQt
20.04

0 Answers