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Barmi
Asked: 2017-04-18 09:58:40 +0800 CST

Port 995 is blocked on Ubuntu 16.04

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I am running a Linux server and can not figure out what is blocking port 995. Firewall ist not running. Who can help?

Thanks, Hans

linux

1 Answers

  1. Is a program listening on this port ? You can check this:

    ss -lnatup | grep 995

    How you check this port ? (From server, other computer ?). You can check this on server with command:

    telnet 127.0.0.1 995

    or (when your application listening only on global IP)

    telnet <SERVER_GLOBAL_IP> 995

    When you check this from other computer, you can check the packet it comes, with tcpdump (running on server):

    tcpdump -ni any port 995 -vvv

    and connecting again with you other computer.

    You can check firewall (iptables) with command:

    iptables -nvL
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