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Refusing smtp and telnet connections
I'm running a new install of RedHat 9. I am unable to make a remote connection to port 25 nor am I able to telnet into the machine. However, I am able to ping the internal lan address and send mail from the local host. I have disabled the local firewall. What gives????
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prefer SSH instead of telnet for security. by the default sendmail smtp daemon listens to only loopback. so u cannot connect to your linux via port 25. u must tell sendmail to listen to all interfaces. if u really want to run telnet. fisr make sure if it works.
run following commands: #ntsysv check telnet is on. #/etc/init.d/xinetd restart good luck |
Telnet in not among the choices. Also, I know that it is refusing smtp connections because I cannot use it to send email from another pc nor can telnet to that address with port 25.
Thanks for any help. |
Maybe something in /etc/hosts.deny that blocks your telnet connections?
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There is nothing in the hosts.deny file. I thought maybe I needed to edit the sendmail.mc file by adding the LAN ip address to the DEAMON_OPTIONS entry. Mine currently looks like this:
DEAMON_OPTIONS(`Port=smtp,Name=MTA')dnl I tried DAEMON_OPTIONS(`Port=smtp,Addr=192.168.1.5, Name=MTA')dnl with 192.168.1.5 being the address assigned to the linux machine. Still, not able to send mail from remote client as well as not accepting anything on port 25. |
r u sure about iptables?
check it again pls #iptables -nvL good luck |
This is what I get.
# iptables -nvL Chain INPUT (policy ACCEPT 1519K packets, 151M bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 2490K packets, 213M bytes) pkts bytes target prot opt in out source destination |
hmm..
can u see that sendmail listens to port 25? #netstat -an|grep tcp|grep 25 also check if sendmail daemon runs #ps aux also check /var/log/messages if there is errors about sendmail good luck. |
1) vi /etc/mail/sendmail.mc
2) Look for the following line: DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl 3) change the above line to: dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl ---or--- you can leave the 127.0.0.1 line and add a second one that references the eth0 address. i.e. DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl DAEMON_OPTIONS(`Port=smtp,Addr=192.168.9.3, Name=MTA')dnl The above is equivelent to commenting the 127.0.0.1 line. i.e. If there is no DAEMON_OPTIONS, then all interfaces are enabled. 4) Save /etc/mail/sendmail.mc after making the above change in step 3 5) Restart sendmail. Since you're using redhat, a new sendmail.cf will be created from sendmail.mc You should be good to go. |
If you cannot telnet into a machine it probably means that the telnet daemon is not running on that machine. In many distributions, I think Redhat is one, they split telnet into a two install process. There is the telnet server, which starts the daemon, and the telnet client, which allows you to telnet to another box. Both portions must be installed and enabled, for telnet to work. You will probably also have to configure the file controlling the activity of the daemon. I think it is located in /etc/xinetd.d. There will be a series of files each controlling the activity of one daemon. You would have to edit the one affecting telnetd, the telnet daemon
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This is what I get now.
[root@linuxws1 mail]# netstat -an|grep tcp|grep 25 tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN [root@linuxws1 mail]# ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.1 1520 492 ? S Oct06 0:04 init root 2 0.0 0.0 0 0 ? SW Oct06 0:00 [keventd] root 3 0.0 0.0 0 0 ? SW Oct06 0:00 [kapmd] root 4 0.0 0.0 0 0 ? SWN Oct06 0:00 [ksoftirqd/0] root 7 0.0 0.0 0 0 ? SW Oct06 0:00 [bdflush] root 5 0.0 0.0 0 0 ? SW Oct06 0:00 [kswapd] root 6 0.0 0.0 0 0 ? SW Oct06 0:00 [kscand] root 8 0.0 0.0 0 0 ? SW Oct06 0:00 [kupdated] root 9 0.0 0.0 0 0 ? SW Oct06 0:00 [mdrecoveryd] root 13 0.0 0.0 0 0 ? SW Oct06 0:00 [kjournald] root 69 0.0 0.0 0 0 ? SW Oct06 0:00 [khubd] root 1033 0.0 0.0 0 0 ? SW Oct06 0:00 [kjournald] root 1351 0.0 0.2 1568 572 ? S Oct06 0:00 syslogd -m 0 root 1355 0.0 0.1 1504 428 ? S Oct06 0:00 klogd -x rpc 1381 0.0 0.2 1652 544 ? S Oct06 0:00 portmap rpcuser 1400 0.0 0.2 1664 596 ? S Oct06 0:00 rpc.statd root 1469 0.0 0.1 1508 472 ? S Oct06 0:00 /usr/sbin/apmd -p 10 -w 5 -W -P /etc/sysconfig/apm-scripts/apmroot 1507 0.0 0.8 8880 2108 ? S Oct06 0:00 /usr/sbin/snmpd -s -l /dev/null -P /var/run/snmpd -a root 1518 0.0 0.6 7596 1680 ? S Oct06 0:33 cupsd root 1551 0.0 0.4 6104 1240 ? S Oct06 1:05 ipp://192.168.1.15/printers/queue1 1 root testprint.ps 1 page-root 1560 0.0 0.4 3564 1072 ? S Oct06 0:00 /usr/sbin/sshd root 1574 0.0 0.2 2132 680 ? S Oct06 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid root 1623 0.0 0.1 1548 428 ? S Oct06 0:00 gpm -t imps2 -m /dev/mouse root 1632 0.0 0.2 1576 572 ? S Oct06 0:00 crond xfs 1664 0.0 1.2 4888 3180 ? S Oct06 0:00 xfs -droppriv -daemon daemon 1673 0.0 0.2 1560 548 ? S Oct06 0:00 /usr/sbin/atd root 1687 0.0 0.1 1512 400 tty1 S Oct06 0:00 /sbin/mingetty tty1 root 1688 0.0 0.1 1492 396 tty2 S Oct06 0:00 /sbin/mingetty tty2 root 1689 0.0 0.1 1508 400 tty3 S Oct06 0:00 /sbin/mingetty tty3 root 1690 0.0 0.1 1508 396 tty4 S Oct06 0:00 /sbin/mingetty tty4 root 1691 0.0 0.1 1508 400 tty5 S Oct06 0:00 /sbin/mingetty tty5 root 1692 0.0 0.1 1500 396 tty6 S Oct06 0:00 /sbin/mingetty tty6 root 1693 0.0 1.2 14320 3152 ? S Oct06 0:00 /usr/bin/gdm-binary -nodaemon root 1746 0.0 1.4 14988 3592 ? S Oct06 0:00 /usr/bin/gdm-binary -nodaemon root 1747 0.0 7.3 89056 18732 ? S Oct06 1:57 /usr/X11R6/bin/X :0 -auth /var/gdm/:0.Xauth vt7 root 1757 0.0 2.2 18548 5724 ? S Oct06 0:00 /usr/bin/gnome-session root 1823 0.0 0.3 3208 828 ? S Oct06 0:00 /usr/bin/ssh-agent /etc/X11/xinit/Xclients root 1833 0.0 3.1 12504 7916 ? S Oct06 0:01 /usr/libexec/gconfd-2 5 root 1836 0.0 0.6 6308 1664 ? S Oct06 0:00 /usr/libexec/bonobo-activation-server --ac-activate --ior-outproot 1838 0.0 1.5 17320 4004 ? S Oct06 0:00 gnome-settings-daemon --oaf-activate-iid=OAFIID:GNOME_Settingsroot 1843 0.0 0.3 2708 832 ? S Oct06 0:00 fam root 1850 0.0 1.9 12960 5072 ? S Oct06 0:04 /usr/bin/metacity --sm-client-id=default1 root 1854 0.0 3.6 21808 9204 ? S Oct06 0:09 gnome-panel --sm-client-id default2 root 1856 0.0 4.2 68668 10840 ? S Oct06 0:06 nautilus --no-default-window --sm-client-id default3 root 1858 0.0 1.4 16008 3620 ? S Oct06 0:00 magicdev --sm-client-id default4 root 1861 0.0 1.7 16820 4504 ? S Oct06 0:00 eggcups --sm-client-id default6 root 1863 0.0 1.2 11716 3248 ? S Oct06 0:00 pam-panel-icon --sm-client-id default0 root 1865 0.0 3.2 24404 8192 ? SN Oct06 0:03 /usr/bin/python /usr/bin/rhn-applet-gui --sm-client-id defaultroot 1866 0.0 0.2 1556 520 ? S Oct06 0:00 /sbin/pam_timestamp_check -d root root 1872 0.0 1.7 16564 4388 ? S Oct06 0:00 /usr/libexec/notification-area-applet --oaf-activate-iid=OAFIIroot 2299 0.0 0.1 1860 468 ? S Oct06 0:00 esd -terminate -nobeeps -as 2 -spawnfd 22 root 3243 0.0 4.0 23556 10280 ? S Oct07 0:04 gnome-terminal root 3244 0.0 0.2 1996 516 ? S Oct07 0:00 gnome-pty-helper root 3245 0.0 0.5 4260 1300 pts/0 S Oct07 0:00 bash root 3278 0.0 0.9 11300 2472 ? S Oct07 0:00 /usr/bin/redhat-config-services root 3279 0.0 0.3 4680 992 ? S Oct07 0:00 /usr/sbin/userhelper -w redhat-config-services root 3280 0.0 0.3 4204 1012 ? S Oct07 0:00 /bin/sh /usr/share/redhat-config-services/redhat-config-servicroot 3281 0.0 3.4 21788 8696 ? S Oct07 0:01 /usr/bin/python /usr/share/redhat-config-services/serviceconf.root 3649 0.7 11.0 103180 28084 ? S 08:33 0:31 /usr/lib/mozilla-1.4/mozilla-bin -UILocale en-US root 3750 0.0 1.0 6308 2664 ? S 09:46 0:00 sendmail: accepting connections smmsp 3759 0.0 0.9 6140 2340 ? S 09:46 0:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue root 3766 0.0 0.2 2724 756 pts/0 R 09:48 0:00 ps aux Also, I made the changes to the sendmail.mc file and saved by using the command: # makemap hash /etc/mail/access < /etc/mail/access # service sendmail restart Still a no go. Also tried: # make -C /etc/mail # service sendmail restart I must be missing something easy but dang!! Anyway thanks for all of the help! |
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so please follow scowles suggestions good luck. |
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Understood. So after I make the changes to sendmail.mc, what command is required to update prior to
#service sendmail restart Please understant that I am kinda new to linux and am having to learn fast or drown! |
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# service sendmail restart - will rebuild sendmail.cf and any sendmail database file that was changed. If you're intersted in howto manually rebuild sendmail.cf from sendmail.mc, like what a "service sendmail start/restart" does... # cd /etc/mail # m4 sendmail.mc >sendmail.cf |
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