I can Telnet from localhost to port 25, but not from a remote computer. Also I can telnet on port 110 local and remote no problem. My server is behind a router, but the server is in a dmz so I do not think that is blocking. Also if I re-start the server I have to manually start the firewall from the ispconfig control panel. Thanks for your help. I believe its a firewall issue. Here is the output from iptables -L Chain INPUT (policy DROP) target prot opt source destination DROP tcp -- anywhere 127.0.0.0/8 ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere DROP all -- BASE-ADDRESS.MCAST.NET/4 anywhere PUB_IN all -- anywhere anywhere PUB_IN all -- anywhere anywhere PUB_IN all -- anywhere anywhere DROP all -- anywhere anywhere Chain FORWARD (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED DROP all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination PUB_OUT all -- anywhere anywhere PUB_OUT all -- anywhere anywhere PUB_OUT all -- anywhere anywhere Chain INT_IN (0 references) target prot opt source destination ACCEPT icmp -- anywhere anywhere DROP all -- anywhere anywhere Chain INT_OUT (0 references) target prot opt source destination ACCEPT icmp -- anywhere anywhere ACCEPT all -- anywhere anywhere Chain PAROLE (9 references) target prot opt source destination ACCEPT all -- anywhere anywhere Chain PUB_IN (3 references) target prot opt source destination ACCEPT icmp -- anywhere anywhere icmp destination-unreachable ACCEPT icmp -- anywhere anywhere icmp echo-reply ACCEPT icmp -- anywhere anywhere icmp time-exceeded ACCEPT icmp -- anywhere anywhere icmp echo-request PAROLE tcp -- anywhere anywhere tcp dpt:ftp PAROLE tcp -- anywhere anywhere tcp dpt:ssh PAROLE tcp -- anywhere anywhere tcp dpt:smtp PAROLE tcp -- anywhere anywhere tcp dpt:domain PAROLE tcp -- anywhere anywhere tcp dpt:http PAROLE tcp -- anywhere anywhere tcp dpt:81 PAROLE tcp -- anywhere anywhere tcp dptop3 PAROLE tcp -- anywhere anywhere tcp dpt:https PAROLE tcp -- anywhere anywhere tcp dpt:10000 ACCEPT udp -- anywhere anywhere udp dpt:domain DROP icmp -- anywhere anywhere DROP all -- anywhere anywhere Chain PUB_OUT (3 references) target prot opt source destination ACCEPT all -- anywhere anywhere
The iptables output looks fine so far. If you stop the ISPConfig firewall by executing Code: ./bastille_firewall stop in your init script directory, can you then reach port 25 from a remote computer?
I stopped the firewall and could not login through telnet on port 25 from remote computer. Maybe its Postfix not working. Thank you for your help.
Have you configured postfix to listen on all network interfaces? execute: Code: postconf -e 'inet_interfaces = all' then restart postfix: Code: /etc/init.d/postfix restart
yes postfix is configured to listen on all interfaces. I restarted the server. This worked before but I bet my provider is blocking port 25 now, I will find out on Monday if they are blocking port 25. Thanks for your help.
