无法通过浏览器访问CentOS 7上的RStudio服务器

我有一个运行CentOS 7的x86_64系统。 我已经安装并configuration了 R和RStudio Server ，但是无法通过http://<server-ip>:8787访问它，正如文档中的build议 。 我在Google Chrome上遇到以下错误：

 This site can't be reached <server-ip> refused to connect. Search Google for 206 196 8787 ERR_CONNECTION_REFUSED 

我尝试并validation了许多networking，防火墙设置。 但是，似乎没有任何工作。

R在系统上工作

 ~$ R R version 3.4.1 (2017-06-30) -- "Single Candle" Copyright (C) 2017 The R Foundation for Statistical Computing Platform: x86_64-redhat-linux-gnu (64-bit) R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type 'license()' or 'licence()' for distribution details. Natural language support but running in an English locale R is a collaborative project with many contributors. Type 'contributors()' for more information and 'citation()' on how to cite R or R packages in publications. Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for an HTML browser interface to help. Type 'q()' to quit R. > print("I Work") [1] "I Work" 

RStudio服务器已configuration并处于活动状态

• Openvpn在防火墙后面失败，但另一个VPN工作
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• 在Windows Vista上保留端口？

 ~$ sudo rstudio-server verify-installation ~$ sudo rstudio-server status ● rstudio-server.service - RStudio Server Loaded: loaded (/etc/systemd/system/rstudio-server.service; enabled; vendor preset: disabled) Active: active (running) since Sat 2017-10-21 21:33:53 MST; 1s ago Process: 8300 ExecStop=/usr/bin/killall -TERM rserver (code=exited, status=0/SUCCESS) Process: 8346 ExecStart=/usr/lib/rstudio-server/bin/rserver (code=exited, status=0/SUCCESS) Main PID: 8349 (rserver) CGroup: /system.slice/rstudio-server.service └─8349 /usr/lib/rstudio-server/bin/rserver Oct 21 21:33:53 localhost.localdomain systemd[1]: Starting RStudio Server... Oct 21 21:33:53 localhost.localdomain systemd[1]: Started RStudio Server. ~$ sudo rstudio-server restart rsession: no process found ~$ sudo rstudio-server start ~$ sudo rstudio-server stop rsession: no process found ~$ sudo rstudio-server start ~$ sudo rstudio-server status ● rstudio-server.service - RStudio Server Loaded: loaded (/etc/systemd/system/rstudio-server.service; enabled; vendor preset: disabled) Active: active (running) since Sat 2017-10-21 21:34:14 MST; 2s ago Process: 8449 ExecStop=/usr/bin/killall -TERM rserver (code=exited, status=0/SUCCESS) Process: 8477 ExecStart=/usr/lib/rstudio-server/bin/rserver (code=exited, status=0/SUCCESS) Main PID: 8480 (rserver) CGroup: /system.slice/rstudio-server.service └─8480 /usr/lib/rstudio-server/bin/rserver Oct 21 21:34:14 localhost.localdomain systemd[1]: Starting RStudio Server... Oct 21 21:34:14 localhost.localdomain systemd[1]: Started RStudio Server. 

netstat输出显示端口可以监听

 ~$ netstat -nat | grep LISTEN tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:8787 0.0.0.0:* LISTEN tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp6 0 0 :::111 :::* LISTEN tcp6 0 0 :::22 :::* LISTEN tcp6 0 0 ::1:631 :::* LISTEN tcp6 0 0 ::1:25 :::* LISTEN 

防火墙说端口是开放的

 ~$ sudo ufw allow 8787 ~$ sudo ufw status Status: active To Action From -- ------ ---- SSH ALLOW Anywhere 224.0.0.251 mDNS ALLOW Anywhere 8787 ALLOW Anywhere SSH (v6) ALLOW Anywhere (v6) ff02::fb mDNS ALLOW Anywhere (v6) 8787 (v6) ALLOW Anywhere (v6) 

systemctl输出

 ~$ sudo systemctl status firewalld ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2017-10-21 20:38:02 MST; 35min ago Docs: man:firewalld(1) Main PID: 2987 (firewalld) CGroup: /system.slice/firewalld.service └─2987 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid ~$ sudo firewall-cmd --zone=public --add-port=8787/tcp Warning: ALREADY_ENABLED: '8787:tcp' already in 'public' success ~$ sudo firewall-cmd --reload success ~$ sudo firewall-cmd --zone=public --list-all public (active) target: default icmp-block-inversion: no interfaces: enp4s0f1 sources: services: dhcpv6-client ssh ports: 8787/tcp protocols: masquerade: no forward-ports: source-ports: icmp-blocks: rich rules: 

任何人都可以请帮我指出我哪里错了？

谢谢。