can't reach to the defult shiny server welcome page

Dear all,

I am setting up shiny server on Ubuntu. I already installed shiny and installed shiny server, and also activate the firewall and allow the connections in ufw for port, but I always meet trouble when shiny server is indeed listening on port 3838.
When I try to input the below command to listen to the port 3838:

sudo netstat -plunt | grep -i shiny

I got below output:


It is not like the same output as it supposed to:

Therefore, when I point my browser to to try to bring up the default shiny server welcome page, it always give me the error “the site can not be reached”. I tried many solutions, but neither is working. So may I ask for a favor from you to suggest any idea about this?

Are you working with a local server or you are using a cloud computing service?

Hi Andres,

I am using a remote server, which is a virtual server belongs to our university network center. I am able to login this server with my username by using Putty.

This seems like a networking issue, I suggest you contact your IT department so they can make sure the port is actually open. Depending on the cloud computing service provider, this might have to be done at the administrator level and not at the instance level.

When I input the command:
nmap -p 80
and can see the output is that 80/tcp closed http,
the similar for 8080: 8080/tcp closed http-proxy
But when I see the status of ports: sudo ufw status
the output is
Status: active

To Action From

80/tcp ALLOW Anywhere
3838/tcp ALLOW Anywhere
3838 ALLOW Anywhere
22/tcp ALLOW Anywhere
Anywhere ALLOW
80/tcp (v6) ALLOW Anywhere (v6)
3838/tcp (v6) ALLOW Anywhere (v6)
3838 (v6) ALLOW Anywhere (v6)
22/tcp (v6) ALLOW Anywhere (v6)

I am not sure if it is due to port 80 status is close, then I can not reach to the welcome page? If yes, how to let it open?

Even if you have 3838 port open on the virtual server, it might have to be open for your instance on the physical server hosting your virtual machine, that is why I advice you to contact your IT department.

Thanks for your reply. I have contacted our IT support and hopefully solve it.

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