Hello, I have an ubuntu 14.04 server running postfix. I wanted to test it with telnet on port 25. Alas I receive connection refused errors although I can ssh to the server fine and see that master is listening on port 25. I ssh'd to another machine outside of my lan and tried telnet from there. I was able to connect fine. Does anyone have any suggestions how I can troubleshoot this? My hosts.deny file is empty. Here's the server's iptables -L output. My wan address is not listed. Thanks for your help! Randy root@foucault:/etc/postfix# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination fail2ban-ErrorAccess tcp -- anywhere anywhere multiport dports http,https fail2ban-ReqLimit tcp -- anywhere anywhere multiport dports http,https fail2ban-dovecot tcp -- anywhere anywhere multiport dports smtp,urd,submission,imap2,imap3,imaps,pop3,pop3s fail2ban-postfix tcp -- anywhere anywhere multiport dports smtp,urd,submission fail2ban-ssh-ddos tcp -- anywhere anywhere multiport dports ssh fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain fail2ban-ErrorAccess (1 references) target prot opt source destination RETURN all -- anywhere anywhere Chain fail2ban-ReqLimit (1 references) target prot opt source destination REJECT all -- hosted-by.sistem724.com.tr anywhere reject-with icmp-port-unreachable RETURN all -- anywhere anywhere Chain fail2ban-dovecot (1 references) target prot opt source destination RETURN all -- anywhere anywhere Chain fail2ban-postfix (1 references) target prot opt source destination RETURN all -- anywhere anywhere Chain fail2ban-ssh (1 references) target prot opt source destination REJECT all -- www.albena.bg anywhere reject-with icmp-port-unreachable REJECT all -- 182.100.67.115 anywhere reject-with icmp-port-unreachable REJECT all -- dynamicip-188-232-146-41.pppoe.omsk.ertelecom.ru anywhere reject-with icmp-port-unreachable REJECT all -- outgoing-auas.carlson.com anywhere reject-with icmp-port-unreachable REJECT all -- 221.233.125.180 anywhere reject-with icmp-port-unreachable REJECT all -- 2h56.xjtu.edu.cn anywhere reject-with icmp-port-unreachable REJECT all -- vps3d196-static.vdrs.net anywhere reject-with icmp-port-unreachable REJECT all -- static.vdc.vn anywhere reject-with icmp-port-unreachable REJECT all -- grupoazul130.static.host.gvt.net.br anywhere reject-with icmp-port-unreachable REJECT all -- 182.100.67.114 anywhere reject-with icmp-port-unreachable REJECT all -- luna933.server4you.de anywhere reject-with icmp-port-unreachable REJECT all -- 115.231.222.45 anywhere reject-with icmp-port-unreachable REJECT all -- 115.239.228.7 anywhere reject-with icmp-port-unreachable REJECT all -- 115.239.228.15 anywhere reject-with icmp-port-unreachable REJECT all -- static.vdc.vn anywhere reject-with icmp-port-unreachable REJECT all -- 218.205.48.105 anywhere reject-with icmp-port-unreachable REJECT all -- 115.239.228.4 anywhere reject-with icmp-port-unreachable REJECT all -- 5-14-20-84.residential.rdsnet.ro anywhere reject-with icmp-port-unreachable REJECT all -- 94.102.53.182 anywhere reject-with icmp-port-unreachable REJECT all -- dynamic.vdc.vn anywhere reject-with icmp-port-unreachable REJECT all -- 59.57.253.94 anywhere reject-with icmp-port-unreachable REJECT all -- 115.239.228.9 anywhere reject-with icmp-port-unreachable REJECT all -- 183.136.216.4 anywhere reject-with icmp-port-unreachable RETURN all -- anywhere anywhere