telnet - Checking if a port is open through the firewall, that has no listener service actually listening -


i have windows 2008 r2 server need listen on particular port (e.g. 1234) in order application upgrade work, application doesn't have listener service configured port 1234.

our firewall managed third party, check in advance port 1234 has been opened before install update. possible?

i know can telnet server on other listening ports, server has no application listening 1234 can't in fact, open. telnet results inconsistent when connecting ports apparently listening in netstat.

is there can in powershell or vb instance, set listener port 1234 in advance of upgrade ensure go smoothly?

many in advance.

anything accepts traffic work.

  1. run other service on port 1234 , see if can connect that.
  2. use network sniffer wireshark on server , see if you're getting connection attempts port 1234.
  3. install netcat on server , tell listen port 1234 connect port on firewall. if connects, port open. (this same #1 without actual service.)

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