先运行以下命令：

appnode ccenter status

检查是否在运行。

如果在运行，检查你的系统防火墙和机房防火墙（服务商后台）设置，是否开放了端口。

另外，用命令：

appnode ccenter config

查看下你的面板是否绑定域名，以及绑定的端口，是否启用https，确保面板登录地址没有错误。

Nov 26 08:39:17 daoke appnode-ccenter-server[706]: Examining /var/tmp/yum-roo...
Nov 26 08:39:17 daoke appnode-ccenter-server[706]: /var/tmp/yum-root-fgGtBS/a...
Nov 26 08:39:17 daoke appnode-ccenter-server[706]: No packages marked for update
Nov 26 08:40:20 daoke systemd[1]: Stopping AppNode CCenter Server...
Nov 26 08:40:20 daoke systemd[1]: Stopped AppNode CCenter Server.
Nov 26 08:40:43 daoke systemd[1]: Started AppNode CCenter Server.
Nov 26 08:40:43 daoke systemd[1]: Starting AppNode CCenter Server...
Nov 26 08:40:45 daoke appnode-ccenter-server[365]: Examining /var/tmp/yum-roo...
Nov 26 08:40:45 daoke appnode-ccenter-server[365]: /var/tmp/yum-root-fgGtBS/a...
Nov 26 08:40:45 daoke appnode-ccenter-server[365]: No packages marked for update
Hint: Some lines were ellipsized, use -l to show in full.
[root@daoke ~]# firewall-cmd --state
not running
[root@daoke ~]# systemctl stop firewalld.service
[root@daoke ~]# systemctl disable firewalld.service
[root@daoke ~]# firewall-cmd --state
not running
[root@daoke ~]# appnode ccenter config
ccenter_ip_addr       : *
ccenter_port          : 8823
ccenter_protocol      : http
ccenter_domain_name   :
ccenter_login_notify  : <not set>
ccenter_tls_cert      :
ccenter_tls_key       :
[root@daoke ~]#

机房防火墙（服务商后台）这个真没有.系统防火关了,还不行,端口自己改的面板登录地址没有错误

firewalld只是个防火墙前端模块，你要用iptables命令来看防火墙规则：

systemctl status iptables
iptables -nL

直接命令测试下，能不能在服务器上打开：

curl http://127.0.0.1:8823/

[root@daoke ~]# systemctl status iptables
* iptables.service - IPv4 firewall with iptables
   Loaded: loaded (/usr/lib/systemd/system/iptables.service; enabled; vendor preset: disabled)
   Active: active (exited) since Mon 2018-11-26 08:40:42 EST; 1h 15min ago
 Main PID: 111 (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/iptables.service

Nov 26 08:27:16 daoke iptables.init[101]: iptables: Applying firewall rules:...]
Nov 26 08:27:16 daoke systemd[1]: Started IPv4 firewall with iptables.
Nov 26 08:40:22 daoke systemd[1]: Stopping IPv4 firewall with iptables...
Nov 26 08:40:22 daoke iptables.init[945]: iptables: Setting chains to policy...]
Nov 26 08:40:22 daoke iptables.init[945]: iptables: Flushing firewall rules:...]
Nov 26 08:40:22 daoke iptables.init[945]: iptables: Unloading modules: [  OK  ]
Nov 26 08:40:22 daoke systemd[1]: Stopped IPv4 firewall with iptables.
Nov 26 08:40:42 daoke systemd[1]: Starting IPv4 firewall with iptables...
Nov 26 08:40:42 daoke iptables.init[111]: iptables: Applying firewall rules:...]
Nov 26 08:40:42 daoke systemd[1]: Started IPv4 firewall with iptables.
Hint: Some lines were ellipsized, use -l to show in full.

[root@daoke ~]# iptables -nL
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
REJECT     all  --  0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

[root@daoke ~]# curl http://127.0.0.1:8823/
<a href="/login">Found</a>.

你的防火墙只允许22端口连接，其它端口全部未放行。

先停止 iptables 服务后就可以外部连接了：

systemctl stop iptables

连接成功后进入面板防火墙应用中添加规则后再启动防火墙。

好的,谢谢.已经正常,非常感谢