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I have WIN XP

I need to Check: there is not firewall between desktop (my PC IP = 23.4.66.129) to other PC (IP 23.4.66.4) port 8443

how to check that? by telnet from cmd Window ?

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up vote 1 down vote accepted

What OS are you running?

  • Run a packet analyzer on the destination PC (something like tcpdump on Linux or wireshark on both Linux and Windows). While you listen on the interface that has 23.4.66.4 bound, do a telnet 23.4.66.4 8443 on the source PC. If you see a connection attempt there's no filtering.
  • Listen on that port for connections with any daemon or, better yet, netcat. nc -l 8443 listens for connections on that port. Then connect from the source PC using nc 23.4.66.4 8443 or telnet 23.4.66.4 8443. If you are able to connect there's no filtering.

Edit: I see you clarified that you're using Windows. There should be a more Windows-friendly way of doing this, but you can still use either Wireshark or the Windows port of netcat.

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Not as a criticism of this answer, but as a warning: some antivirus and firewalls may raise alarm bells on nc (netcat) or nmap. It's not bad to let your and remote network administrators know that you are going to do. –  port tester Aug 2 '11 at 17:11
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