$ sudo netstat -plnt | grep rdp
tcp 0 0 127.0.0.1:3350 0.0.0.0:* LISTEN 83971/xrdp-sesman
如您所见，xrdp 没有监听端口 3389。
$ tail -f /var/log/syslog
May 3 04:19:36 vmName systemd[1]: Starting LSB: disk temperature monitoring daemon...
May 3 04:19:36 vmName systemd[1]: Started LSB: disk temperature monitoring daemon.
May 3 04:19:37 vmName systemd[1]: Reloading.
May 3 04:19:37 vmName systemd[1]: Started ACPI event daemon.
May 3 04:19:37 vmName systemd[1]: Reloading.
May 3 04:19:37 vmName systemd[1]: Started ACPI event daemon.
May 3 04:19:37 vmName systemd[1]: Reloading.
May 3 04:19:37 vmName systemd[1]: Started ACPI event daemon.
May 3 04:24:08 vmName start_jupyterhub.sh[2210]: 04:24:08.613 [ConfigProxy] #033[32minfo#033[39m: 200 GET /api/routes
May 3 04:24:08 vmName start_jupyterhub.sh[2210]: [I 2020-05-03 04:24:08.613 JupyterHub proxy:319] Checking routes
May 3 04:29:08 vmName start_jupyterhub.sh[2210]: 04:29:08.613 [ConfigProxy] #033[32minfo#033[39m: 200 GET /api/routes
May 3 04:29:08 vmName start_jupyterhub.sh[2210]: [I 2020-05-03 04:29:08.613 JupyterHub proxy:319] Checking routes
$ telnet PUBLIC_IP 3389
Trying PUBLIC_IP...
telnet: Unable to connect to remote host: Connection refused
$ sudo systemctl status xrdp
● xrdp.service - LSB: Start xrdp and sesman daemons
Loaded: loaded (/etc/init.d/xrdp; bad; vendor preset: enabled)
Active: active (running) since Sun 2020-05-03 04:05:37 UTC; 14min ago
Docs: man:systemd-sysv-generator(8)
CGroup: /system.slice/xrdp.service
└─83971 /usr/sbin/xrdp-sesman
May 03 04:05:37 vmName systemd[1]: Starting LSB: Start xrdp and sesman daemons..
May 03 04:05:37 vmName xrdp[83956]: * Starting Remote Desktop Protocol server
May 03 04:05:37 vmName xrdp[83956]: ...done.
May 03 04:05:37 vmName systemd[1]: Started LSB: Start xrdp and sesman daemons.
我正在尝试与 Azure Cloud 上的 Linux VM 建立 RDP 连接。如上所示，我可以通过 ssh 进行连接。NSG（防火墙）允许此端口，但 RDP 未监听此端口。
以下是部分输出：
$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere multiport dports 3853
ACCEPT tcp -- anywhere anywhere multiport dports 3853
...
ACCEPT tcp -- anywhere anywhere multiport dports ldap
ACCEPT tcp -- anywhere anywhere multiport dports 3389
ACCEPT tcp -- anywhere anywhere multiport dports 3389
...
ACCEPT tcp -- anywhere anywhere multiport dports ldap
ACCEPT tcp -- anywhere anywhere multiport dports ldap
...
Chain FORWARD (policy DROP)
target prot opt source destination
DOCKER-USER all -- anywhere anywhere
DOCKER-ISOLATION-STAGE-1 all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
DOCKER all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere multiport dports 3853
Chain DOCKER (1 references)
target prot opt source destination
Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target prot opt source destination
DOCKER-ISOLATION-STAGE-2 all -- anywhere anywhere
RETURN all -- anywhere anywhere
Chain DOCKER-ISOLATION-STAGE-2 (1 references)
target prot opt source destination
DROP all -- anywhere anywhere
RETURN all -- anywhere anywhere
Chain DOCKER-USER (1 references)
target prot opt source destination
RETURN all -- anywhere anywhere