I have port output from nmap scan below.

1102/tcp open ssl/adobeserver-1?

1104/tcp open ssl/xrl?

1105/tcp open ssl/ftranhc?

1106/tcp open ssl/isoipsigport-1?

I tried telnet and openssl s_client -host *host* -port *port* and connected to these ports. But I don't get any answer.

How to communicate with them? The don't response at all.

  • What operating system is the target machine running? Sep 5, 2016 at 17:39
  • @korockinout13, Linux Sep 7, 2016 at 10:55
  • Do you have shell access on the target machine? Sep 7, 2016 at 17:35
  • @korockinout13, No( Sep 9, 2016 at 5:48

1 Answer 1


That depends on the service listening to these ports. Often when ports are in sequence, like your output, there is just one process running multiple instances each bound to its own port.

Without any info about the server, it is hard to tell what protocol is used to communicate over these ports. For all we know it's a custom network protocol, allowing only certain types of data or addresses.

You could feed a stream of /dev/urandom endlessly to see if something comes back. I can ensure you, the successrate is low.

  • Thank you. I thought that any process should give something as response to any request. Like "qwe-qwe"->"Hi, my name is service and I do not understand you. Please, go home." Sep 5, 2016 at 15:06
  • 1
    @user3360601: this depends entirely on the application protocol spoken. For example HTTP or SSL will wait for the client to start. If the client send nonconforming data SSL will probably just close the connection while others will just wait until they get the expected data. SMTP, POP, IMAP, FTP start with a message send by the server to the client. Sep 5, 2016 at 15:17

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