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I have an app running on port 9100 on a remote server serving http pages. After I ssh into the server I can curl localhost 9100 and I receive the response.
However I am unable to access the same app from the browser using http://ip:9100
I am also unable to telnet from my local PC. How do I debug it? Is there a way to traceroute a particular IP and port combination, to see where it is being blocked?
Any linux tools / commands / utilities will be appreciated.
Thanks, Murtaza
332
A TCP "traceroute" run to a domain on a specific port should give a good idea as to where the traffic is being dropped. A traceroute simply shows the 'path' on the Internet between the host where the traceroute is run and the destination that's specified as well as where, if anywhere, the route is failing to complete.
Ping a Specific Port Using Telnet 1. To check whether telnet is already installed, open a terminal window and enter telnet . The <address> syntax is the domain or the IP address of the host, while <port_number> is the port you want to ping. If the port is open, telnet establishes a connection.
You can use the default traceroute command for this purpose, then there will be nothing to install.
traceroute -T -p 9100 <IP address/hostname> The -T argument is required so that the TCP protocol is used instead of UDP.
In the rare case when traceroute isn't available, you can also use ncat.
nc -Czvw 5 <IP address/hostname> 9100 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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