Dear all,

I have an issue accessing port 25 from outside anything but my localhost.

Telnet to port 25 to localhost works fine:

[root@fileserver ~]# telnet localhost 25

Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 localhost.localdomain ESMTP Sendmail 8.14.2/8.14.2; Sat, 23 May 2009 20:09:4
4 +0200

And I can see port 25 when running an nmap on localhost....
nmap localhost

Starting Nmap 4.53 ( http://insecure.org ) at 2009-05-23 20:02 CEST
Interesting ports on fileserver (127.0.0.1):
Not shown: 1699 closed ports
PORT STATE SERVICE
22/tcp open ssh
25/tcp open smtp
80/tcp open http
110/tcp open pop3
111/tcp open rpcbind
139/tcp open netbios-ssn
143/tcp open imap
445/tcp open microsoft-ds
631/tcp open ipp
993/tcp open imaps
995/tcp open pop3s
2049/tcp open nfs
3128/tcp open squid-http
3306/tcp open mysql

But not when running nmap on the private ip adress in my lan:

nmap 192.168.1.140
Starting Nmap 4.53 ( http://insecure.org ) at 2009-05-23 20:03 CEST
Interesting ports on 192.168.1.140:
Not shown: 1701 closed ports
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
110/tcp open pop3
111/tcp open rpcbind
139/tcp open netbios-ssn
143/tcp open imap
445/tcp open microsoft-ds
993/tcp open imaps
995/tcp open pop3s
2049/tcp open nfs
3128/tcp open squid-http
3306/tcp open mysql

I disabled the firewall.

Distribution: Fedora 9
Kernel: 2.6.27.19-78.2.30.fc9.i686

ifconfig
eth3 Link encap:Ethernet HWaddr 00:0C:29C:1D:68
inet addr:192.168.1.140 Bcast:192.168.1.255 Mask:255.255.2
inet6 addr: fe80::20c:29ff:fedc:1d68/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:472046 errors:25 dropped:25 overruns:0 frame:0
TX packets:386317 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:397754081 (379.3 MiB) TX bytes:192977439 (184.0 Mi
Interrupt:10 Base address:0x1080

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:52235 errors:0 dropped:0 overruns:0 frame:0
TX packets:52235 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8424949 (8.0 MiB) TX bytes:8424949 (8.0 MiB)

I suspect a filter / firewall issue on my router (DIR-655 running firmware 1.11EU) but tried disabling port forwarding to port 25 and the virtual server functionality on SMTP on port 25.

Any pointers will be much appreciated.

Hi,

By default sendmail listens only on the local loopback interface. If you want to make it listen also on your public IP, and since you're fc9, take a look at this howto.

Regards

Thanks a lot bathory! This did the trick. Regards, Dirk-Jan