在我的 ubuntu 框中，我在端口 27000 上运行 flexlm 许可软件，并且我能够从此端口提取许可证以在本地运行模拟软件。
我也尝试使用 Ubuntu 机器的 flexlm 许可证在另一台 Linux 机器 (opensuse) 上运行相同的软件。但是，我的 opensuse 机器无法与 Ubuntu 机器中的端口 27000 通信。
我关闭了 Ubuntu 机器上的防火墙，尝试了 iptables，当我nmap从 openSUSE 机器到 Ubuntu 机器时，我收到的消息是端口 27000 处于过滤状态。我的理解是，过滤状态不允许 openSUSE 机器与 Ubuntu 通信。
我的问题是如何将端口 27000 从过滤状态更改为开放状态？希望有人能帮助我。谢谢。
Andy，这是 iptables，我正在使用 UFW
cranjan@ubuntu:~$ sudo iptables -L
[sudo] password for cranjan:
Chain INPUT (policy DROP)
target prot opt source destination
fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh
ACCEPT all -- anywhere anywhere
in_home all -- anywhere anywhere
in_windows all -- anywhere anywhere
ACCEPT all -- anywhere anywhere state RELATED
LOG all -- anywhere anywhere limit: avg 1/sec burst 5 LOG level warning prefix `'IN-unknown:''
DROP all -- anywhere anywhere
Chain FORWARD (policy DROP)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED
LOG all -- anywhere anywhere limit: avg 1/sec burst 5 LOG level warning prefix `'PASS-unknown:''
DROP all -- anywhere anywhere
Chain OUTPUT (policy DROP)
target prot opt source destination
ACCEPT all -- anywhere anywhere
out_home all -- anywhere anywhere
out_windows all -- anywhere anywhere
ACCEPT all -- anywhere anywhere state RELATED
LOG all -- anywhere anywhere limit: avg 1/sec burst 5 LOG level warning prefix `'OUT-unknown:''
DROP all -- anywhere anywhere
Chain fail2ban-ssh (1 references)
target prot opt source destination
RETURN all -- anywhere anywhere
Chain in_home (1 references)
target prot opt source destination
in_home_all_c1 all -- anywhere anywhere
in_home_irc_c2 all -- anywhere anywhere
in_home_ftp_c3 all -- anywhere anywhere
in_home_ssh_s4 all -- anywhere anywhere
in_home_ping_s5 all -- anywhere anywhere
in_home_samba_s6 all -- anywhere anywhere
in_home_samba_c7 all -- anywhere anywhere
ACCEPT all -- anywhere anywhere state RELATED
LOG all -- anywhere anywhere limit: avg 1/sec burst 5 LOG level warning prefix `''IN-home':''
DROP all -- anywhere anywhere
Chain in_home_all_c1 (1 references)
target prot opt source destination
ACCEPT all -- anywhere anywhere state ESTABLISHED
Chain in_home_ftp_c3 (1 references)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp spt:ftp dpts:32768:61000 state ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp spt:ftp-data dpts:32768:61000 state RELATED,ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp spts:1024:65535 dpts:32768:61000 state ESTABLISHED
Chain in_home_irc_c2 (1 references)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp spt:ircd dpts:32768:61000 state ESTABLISHED
Chain in_home_ping_s5 (1 references)
target prot opt source destination
ACCEPT icmp -- anywhere anywhere state NEW,ESTABLISHED icmp echo-request
Chain in_home_samba_c7 (1 references)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp spt:netbios-ns dpt:netbios-ns state ESTABLISHED
ACCEPT udp -- anywhere anywhere udp spt:netbios-ns dpts:32768:61000 state ESTABLISHED
ACCEPT udp -- anywhere anywhere udp spt:netbios-dgm dpt:netbios-dgm state ESTABLISHED
ACCEPT udp -- anywhere anywhere udp spt:netbios-dgm dpts:32768:61000 state ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp spt:netbios-ssn dpts:32768:61000 state ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp spt:microsoft-ds dpts:32768:61000 state ESTABLISHED
Chain in_home_samba_s6 (1 references)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp spt:netbios-ns dpt:netbios-ns state NEW,ESTABLISHED
ACCEPT udp -- anywhere anywhere udp spts:1024:65535 dpt:netbios-ns state NEW,ESTABLISHED
ACCEPT udp -- anywhere anywhere udp spt:netbios-dgm dpt:netbios-dgm state NEW,ESTABLISHED
ACCEPT udp -- anywhere anywhere udp spts:1024:65535 dpt:netbios-dgm state NEW,ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp spts:1024:65535 dpt:netbios-ssn state NEW,ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp spts:1024:65535 dpt:microsoft-ds state NEW,ESTABLISHED
Chain in_home_ssh_s4 (1 references)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp spts:1024:65535 dpt:ssh state NEW,ESTABLISHED
Chain in_windows (1 references)
target prot opt source destination
in_windows_smtp_s1 all -- anywhere anywhere
in_windows_http_s2 all -- anywhere anywhere
in_windows_ftp_s3 all -- anywhere anywhere
in_windows_dns_s4 all -- anywhere anywhere
in_windows_squid_s5 all -- anywhere anywhere
in_windows_dhcp_s6 all -- anywhere anywhere
in_windows_http_s7 all -- anywhere anywhere
in_windows_icmp_s8 all -- anywhere anywhere
in_windows_icmp_c9 all -- anywhere anywhere
ACCEPT all -- anywhere anywhere state RELATED
LOG all -- anywhere anywhere limit: avg 1/sec burst 5 LOG level warning prefix `''IN-windows':''
DROP all -- anywhere anywhere
Chain in_windows_dhcp_s6 (1 references)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp spt:bootpc dpt:bootps
Chain in_windows_dns_s4 (1 references)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp spt:3128 dpts:1024:65535 state ESTABLISHED netstat-anigrep cranjan@ubuntu:~$ netstat -an|grep LIST
tcp 0 0 0.0.0.0:445 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:49493 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:27000 0.0.0.0:* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:631 :::* LISTEN
unix 2 [ ACC ] STREAM LISTENING 10192 /tmp/orbit-cranjan/linc-849-0-5cf869d15b3ec
unix 2 [ ACC ] STREAM LISTENING 8754 @/tmp/dbus-OEZITogft8
unix 2 [ ACC ] STREAM LISTENING 10203 /tmp/orbit-cranjan/linc-848-0-32221e795bc88
unix 2 [ ACC ] STREAM LISTENING 10635 /tmp/orbit-cranjan/linc-855-0-43c3de6d81f95
unix 2 [ ACC ] STREAM LISTENING 10657 /tmp/orbit-cranjan/linc-853-0-217a10f785bd6
unix 2 [ ACC ] STREAM LISTENING 10663 /tmp/orbit-cranjan/linc-859-0-e63817d85cf2
unix 2 [ ACC ] STREAM LISTENING 10752 /tmp/orbit-cranjan/linc-860-0-275125c19a706
unix 2 [ ACC ] STREAM LISTENING 10760 /tmp/orbit-cranjan/linc-857-0-1b7175879ac02
unix 2 [ ACC ] STREAM LISTENING 10779 /tmp/orbit-cranjan/linc-85a-0-4dd32e9c9daed
unix 2 [ ACC ] STREAM LISTENING 10901 /tmp/orbit-cranjan/linc-864-0-66e40c5eb66ae
unix 2 [ ACC ] STREAM LISTENING 11414 /tmp/orbit-cranjan/linc-86c-0-5afc43ec99b12
unix 2 [ ACC ] STREAM LISTENING 11652 /tmp/orbit-cranjan/linc-86f-0-6909ae8e71c13
unix 2 [ ACC ] STREAM LISTENING 28839 /tmp/orbit-cranjan/linc-8ce-0-67cf32c7a4000
unix 2 [ ACC ] STREAM LISTENING 146671 /tmp/orbit-cranjan/linc-940-0-1cca5987ea42
unix 2 [ ACC ] STREAM LISTENING 4645 /var/run/acpid.socket
unix 2 [ ACC ] STREAM LISTENING 7005 @/var/run/hald/dbus-9rWZEhUxZV
unix 2 [ ACC ] STREAM LISTENING 2665 @/com/ubuntu/upstart
unix 2 [ ACC ] STREAM LISTENING 4157 /var/run/dbus/system_bus_socket
unix 2 [ ACC ] STREAM LISTENING 4883 @/tmp/.X11-unix/X0
unix 2 [ ACC ] STREAM LISTENING 5741 /var/run/cups/cups.sock
unix 2 [ ACC ] STREAM LISTENING 7036 /var/run/fail2ban/fail2ban.sock
unix 2 [ ACC ] STREAM LISTENING 8741 /tmp/ssh-Awxvql2002/agent.2002
unix 2 [ ACC ] STREAM LISTENING 5281 @/tmp/gdm-greeter-EhaaTCYd
unix 2 [ ACC ] STREAM LISTENING 8782 @/tmp/.ICE-unix/2002
unix 2 [ ACC ] STREAM LISTENING 4283 /var/run/avahi-daemon/socket
unix 2 [ ACC ] STREAM LISTENING 8783 /tmp/.ICE-unix/2002
unix 2 [ ACC ] STREAM LISTENING 4884 /tmp/.X11-unix/X0
unix 2 [ ACC ] STREAM LISTENING 8803 /tmp/orbit-cranjan/linc-7fb-0-394d0c2c7bba5
unix 2 [ ACC ] STREAM LISTENING 9022 /tmp/orbit-cranjan/linc-7d2-0-749e269d7e12a
unix 2 [ ACC ] STREAM LISTENING 9152 /tmp/keyring-27bLif/ssh
unix 2 [ ACC ] STREAM LISTENING 20196 /tmp/orbit-cranjan/linc-89e-0-7a28b4d49ee3d
unix 2 [ ACC ] STREAM LISTENING 20261 /tmp/orbit-cranjan/linc-8a4-0-5c25fd95ab7d8
unix 2 [ ACC ] STREAM LISTENING 20349 /tmp/orbit-cranjan/linc-8a8-0-7a28b4d4b67cd
unix 2 [ ACC ] STREAM LISTENING 5458 @/tmp/gdm-session-VYGLKeYD
unix 2 [ ACC ] STREAM LISTENING 8495 /tmp/keyring-27bLif/control
unix 2 [ ACC ] STREAM LISTENING 9154 /tmp/keyring-27bLif/pkcs11
unix 2 [ ACC ] STREAM LISTENING 9171 /tmp/orbit-cranjan/linc-802-0-6eb9d50bd0fdc
unix 2 [ ACC ] STREAM LISTENING 9957 /tmp/orbit-cranjan/linc-816-0-2ed05eef44122
unix 2 [ ACC ] STREAM LISTENING 9664 /tmp/orbit-cranjan/linc-811-0-7c48fbd4f30bc
unix 2 [ ACC ] STREAM LISTENING 9666 /tmp/orbit-cranjan/linc-80f-0-655b9438f3104
unix 2 [ ACC ] STREAM LISTENING 9668 /tmp/orbit-cranjan/linc-815-0-3100350bf3161
unix 2 [ ACC ] STREAM LISTENING 9682 /tmp/orbit-cranjan/linc-814-0-399a7b5bf360b
unix 2 [ ACC ] STREAM LISTENING 9688 /tmp/orbit-cranjan/linc-818-0-14a559eef3944
unix 2 [ ACC ] STREAM LISTENING 9829 /tmp/.esd-1000/socket
unix 2 [ ACC ] STREAM LISTENING 9832 /home/cranjan/.pulse/77caea2cdb600d3427a2a8684c86c409-runtime/native
unix 2 [ ACC ] STREAM LISTENING 9928 /tmp/orbit-cranjan/linc-834-0-4a80ef294001d
unix 2 [ ACC ] STREAM LISTENING 7000 @/var/run/hald/dbus-xHxwQeLK6K
unix 2 [ ACC ] STREAM LISTENING 10073 /tmp/orbit-cranjan/linc-83c-0-4d7ce2a153a11
cranjan@ubuntu:~$ Thanks for your help.