Am 18.10.2010 22:38, schrieb Dotan Cohen:
On Mon, Oct 18, 2010 at 22:34, Steve Clark sclark@netwolves.com wrote:
Hmm... I am not having any problem connecting from the U.S.
ping 178.63.65.136 PING 178.63.65.136 (178.63.65.136) 56(84) bytes of data. 64 bytes from 178.63.65.136: icmp_seq=1 ttl=49 time=140 ms 64 bytes from 178.63.65.136: icmp_seq=2 ttl=49 time=142 ms 64 bytes from 178.63.65.136: icmp_seq=3 ttl=49 time=138 ms
telnet 178.63.65.136 25 Trying 178.63.65.136... Connected to 178.63.65.136. Escape character is '^]'. ^] telnet> close Connection closed.
Exactly the problem! It pings fine (so I know that connections can be established over the physical wires) and on the IP address telnet answers. However, telnet to port 25 (smtp) with the domain name fails. Why could that be?
Sorry, your problem is not DNS. The MX resolves.
But if you talk to an MTA on port 25 you must get a greeting - that does not happen. Instead the connection hangs.
While your www server works:
~ $ telnet 178.63.65.136 80 Trying 178.63.65.136... Connected to static.136.65.63.178.clients.your-server.de (178.63.65.136). Escape character is '^]'. GET / HTTP/1.0
HTTP/1.1 200 OK Date: Mon, 18 Oct 2010 20:54:23 GMT Server: Apache/2.2.3 (CentOS) Last-Modified: Fri, 08 Oct 2010 21:00:56 GMT ETag: "c7a1c2-28-4e88b200" Accept-Ranges: bytes Content-Length: 40 Connection: close Content-Type: text/html; charset=UTF-8
<html><body>Hello, world!</body></html> Connection closed by foreign host.
~ $ telnet sharingcenter.eu 80 Trying 178.63.65.136... Connected to sharingcenter.eu (178.63.65.136). Escape character is '^]'. GET / HTTP/1.0
HTTP/1.1 200 OK Date: Mon, 18 Oct 2010 20:55:16 GMT Server: Apache/2.2.3 (CentOS) Last-Modified: Fri, 08 Oct 2010 21:00:56 GMT ETag: "c7a1c2-28-4e88b200" Accept-Ranges: bytes Content-Length: 40 Connection: close Content-Type: text/html; charset=UTF-8
<html><body>Hello, world!</body></html> Connection closed by foreign host.
I expect that even being local on the server(s) and running "telnet localhost 25" results in a hung connection.
You misconfigured your Postfix. Check your /var/log/maillog/ for startup errors.
By any chance, did you bring down loopback or destroyed the localhost mapping in /etc/hosts? Or you have something broken in your main.cf. Post the output of "postconf -n".
Alexander