我正在尝试使用远程桌面（Windows 10）和 Remmina 1.4.29（Ubuntu）通过 RDP 连接到 Ubuntu 20.04，但到目前为止还没有成功。我可以通过 SSH 成功连接到服务器。防火墙处于非活动状态。除了默认的自动协商之外，我尝试了所有安全协议协商（NLA、TLS、RDP、NLA）。仅供参考，我可以使用此版本的 Remmina 通过 RDP 连接到其他 Ubuntu 20.04 服务器。
我也尝试在远程桌面注销后进行连接，但问题仍然存在。
我正在尝试连接的 Ubuntu 中的 xrdp 状态：
xrdp.service - xrdp daemon
Loaded: loaded (/lib/systemd/system/xrdp.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2023-02-15 17:08:59 EET; 12min ago
Docs: man:xrdp(8)
man:xrdp.ini(5)
Process: 1004 ExecStartPre=/bin/sh /usr/share/xrdp/socksetup (code=exited, status=0/SUCCESS)
Process: 1013 ExecStart=/usr/sbin/xrdp $XRDP_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 1020 (xrdp)
Tasks: 1 (limit: 18801)
Memory: 1.2M
CGroup: /system.slice/xrdp.service
└─1020 /usr/sbin/xrdp
Φεβ 15 17:08:58 iti-1054 xrdp[1013]: (1013)(140503119861568)[INFO ] IPv6 not supported, falling back to IPv4
Φεβ 15 17:08:58 iti-1054 xrdp[1013]: (1013)(140503119861568)[INFO ] xrdp_listen_pp done
Φεβ 15 17:08:58 iti-1054 xrdp[1013]: (1013)(140503119861568)[DEBUG] Closed socket 7 (AF_INET 0.0.0.0:3389)
Φεβ 15 17:08:58 iti-1054 systemd[1]: xrdp.service: Can't open PID file /run/xrdp/xrdp.pid (yet?) after start: Operation not permitted
Φεβ 15 17:08:59 iti-1054 systemd[1]: Started xrdp daemon.
Φεβ 15 17:09:00 iti-1054 xrdp[1020]: (1020)(140503119861568)[INFO ] starting xrdp with pid 1020
Φεβ 15 17:09:00 iti-1054 xrdp[1020]: (1020)(140503119861568)[INFO ] address [0.0.0.0] port [3389] mode 1
Φεβ 15 17:09:00 iti-1054 xrdp[1020]: (1020)(140503119861568)[INFO ] listening to port 3389 on 0.0.0.0
Φεβ 15 17:09:00 iti-1054 xrdp[1020]: (1020)(140503119861568)[INFO ] IPv6 not supported, falling back to IPv4
Φεβ 15 17:09:00 iti-1054 xrdp[1020]: (1020)(140503119861568)[INFO ] xrdp_listen_pp done
当我尝试连接时，Remmina 给出的错误消息是：
This window can help you find connection problems.
You can stop and start the logging at any moment using the On/Off switch.
The stats button (Ctrl+T), can be useful to gather system info you may share when reporting a bug.
There is more info about debugging Remmina on https://gitlab.com/Remmina/Remmina/-/wikis/Usage/Remmina-debugging
(DEBUG) - (rcw_map_event) - Mapping: RemminaConnectionWindow
(DEBUG) - (remmina_protocol_widget_map_event) - Calling plugin mapping function
(DEBUG) - (remmina_protocol_widget_open_connection_real) - Opening connection
(DEBUG) - (remmina_rdp_event_init) - Disable smooth scrolling is set to 0
(DEBUG) - (remmina_rdp_event_init) - Adding GDK_SMOOTH_SCROLL_MASK
(DEBUG) - (remmina_protocol_widget_open_connection_real) - Have SSH
(DEBUG) - (remmina_rdp_main) - RDP data path is /home/gadolias/.local/share/remmina/RDP
(DEBUG) - (remmina_rdp_main) - Not using system proxy settings
(DEBUG) - (remmina_rdp_tunnel_init) - Tunnel init
(DEBUG) - (remmina_protocol_widget_start_direct_tunnel) - SSH tunnel initialization…
(DEBUG) - (remmina_protocol_widget_start_direct_tunnel) - Calling remmina_public_get_server_port
(DEBUG) - (remmina_protocol_widget_start_direct_tunnel) - Calling remmina_public_get_server_port (tunnel)
(DEBUG) - (remmina_protocol_widget_start_direct_tunnel) - server: 160.40.50.88, port: 3389
(DEBUG) - (remmina_rdp_tunnel_init) - protocol_plugin_start_direct_tunnel() returned [160.40.50.88]:3389
(DEBUG) - (remmina_rdp_tunnel_init) - Tunnel has been optionally initialized. Now connecting to 160.40.50.88:3389
(DEBUG) - (remmina_rdp_main) - gfx_h264_available: 1
(DEBUG) - (remmina_rdp_main) - Resolution set by the user: 1868x996
(DEBUG) - (remmina_rdp_main) - Resolution set after workarounds: 1868x996
(DEBUG) - (remmina_rdp_main) - proxy_type: (null)
(DEBUG) - (remmina_rdp_main) - proxy_username: (null)
(DEBUG) - (remmina_rdp_main) - proxy_password: (null)
(DEBUG) - (remmina_rdp_main) - proxy_hostname: (null)
(DEBUG) - (remmina_rdp_main) - proxy_port: 80
(DEBUG) - (remmina_rdp_main) - Network settings not set
(DEBUG) - (remmina_rdp_main) - rdp_keyboard_remapping_list:
(DEBUG) - (remmina_rdp_main) - Log level set to to DEBUG
(DEBUG) - (rco_on_disconnect) - Disconnect signal received on RemminaProtocolWidget
(DEBUG) - (remmina_file_save) - Saving profile
(DEBUG) - (remmina_file_save) - We have a secret and disablepasswordstoring=0
(DEBUG) - (remmina_plugin_glibsecret_store_password) - Password “password” saved for file /home/gadolias/.local/share/remmina/group_rdp_iti-1054_160-40-50-88.remmina
(DEBUG) - (remmina_file_save) - We have a secret and disablepasswordstoring=0
(DEBUG) - (remmina_plugin_glibsecret_delete_password) - password “ssh_tunnel_password” deleted for file /home/gadolias/.local/share/remmina/group_rdp_iti-1054_160-40-50-88.remmina
(DEBUG) - (remmina_file_save) - We have a secret and disablepasswordstoring=0
(DEBUG) - (remmina_plugin_glibsecret_delete_password) - password “gateway_password” deleted for file /home/gadolias/.local/share/remmina/group_rdp_iti-1054_160-40-50-88.remmina
(DEBUG) - (remmina_file_save) - We have a secret and disablepasswordstoring=0
(DEBUG) - (remmina_plugin_glibsecret_delete_password) - password “ssh_tunnel_passphrase” deleted for file /home/gadolias/.local/share/remmina/group_rdp_iti-1054_160-40-50-88.remmina
(DEBUG) - (remmina_file_save) - Profile saved
(DEBUG) - (remmina_file_save) - Connection profile states saved
(DEBUG) - (remmina_network_monitor_status) - G_NETWORK_CONNECTIVITY_FULL
(DEBUG) - (rco_on_disconnect) - Could not disconnect
任何帮助都非常感谢。提前致谢。