I have trouble connecting to an SMTP server from my PC. I use Debian sid.
telnet mail.example.com 25 Trying 18.104.22.168... telnet: Unable to connect to remote host: Connection timed out
While from another Debian PC from outside my network:
telnet mail.example.com 25 Trying 22.214.171.124... Connected to mail.example.com. Escape character is '^]'. 220 mail.example.com ESMTP Exim 4.63 Mon, 02 Apr 2012 22:14:09 +0200
ping hangs forever as well, and when I hit Ctrl+C it says "100% packet loss".
traceroute is full of asterisks:
traceroute mail.example.com traceroute to mail.example.com (126.96.36.199), 30 hops max, 60 byte packets 1 * * * 2 * * * 3 * * * ... 27 * * * 28 * * * 29 * * * 30 * * *
When I run
nmap against the server port 25:
nmap mail.example.com -p25 Starting Nmap 5.21 ( http://nmap.org ) at 2012-04-02 23:08 EEST Nmap scan report for mail.example.com (188.8.131.52) Host is up (0.090s latency). PORT STATE SERVICE 25/tcp filtered smtp Nmap done: 1 IP address (1 host up) scanned in 0.88 seconds
And finally my
iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination
Any ideas? Thanks a lot for any help.