How To Fix: 451 4.1.8 Possibly Forged Hostname

Jun 17, 2009

one of my clients told me he tried to send an email to somebody and he receives this error:

The addresses to which the message has not yet been delivered are:

a.......u@a.......t.ro
Delay reason: SMTP error from remote mail server after MAIL FROM:<a.......r@i.....s.ro>:
host mail.a.....t.ro [82.77.203.xx]: 451 4.1.8 Possibly forged hostname for 67.222.136.xx

No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you.
Last message received on 17.06.2009 at 16:10

Any ideea what might be? he's having this problem only when tries to send an email to that email address, and I'm not sure if it's a problem on our server or on their server

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Exim: Helo Invalid (forged)

Nov 29, 2007

I seem to be having a problem with domain forwarding in cPanel.

I have 3 cPanel accounts:

1) foobar.com.np with a POP3 account and forwarders for info@foobar.com.np. Works fine.

2) foobar.com with domain forwarding to foobar.com.np. Works fine too when I send an email to info@foobar.com.

3) foo.com.np with domain forwarding to foobar.com.np. Doesn't work! When I send a message to info@foo.com.np I get the following message in my Exim log:

Code:
2007-11-29 04:11:32 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1IxgMm-0007DW-0m
2007-11-29 04:11:32 1IxgMm-0007DW-0m ** info@foo.com.np R=lookuphost T=remote_smtp: SMTP error from remote mail server after MAIL FROM:<noreply@********.com> SIZE=2059: host foo.com.np [74.86.*.*]: 554 5.7.1 Helo invalid(forged)
2007-11-29 04:11:32 cwd=/var/spool/exim 7 args: /usr/sbin/exim -t -oem -oi -f <> -E1IxgMm-0007DW-0m
2007-11-29 04:11:32 1IxgMm-0007Da-Bd <= <> R=1IxgMm-0007DW-0m U=mailnull P=local S=2006 T="Mail delivery failed: returning message to sender"
2007-11-29 04:11:32 1IxgMm-0007DW-0m Completed
...
As you can see, this domain forwarder is not functioning like the other one (foobar.com) since the domain forwarder for foobar.com DOES actually work:

Code:
2007-11-29 03:58:21 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1IxgA0-0002Gs-Vb
2007-11-29 03:58:21 1IxgA0-0002Gs-Vb => info <info@foobar.com> R=virtual_user T=virtual_userdelivery
2007-11-29 03:58:22 1IxgA0-0002Gs-Vb => *******@gmail.com <info@foobar.com> R=lookuphost T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.133.27]
2007-11-29 03:58:22 1IxgA0-0002Gs-Vb -> *******@gmail.com <info@foobar.com> R=lookuphost T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.133.27]
2007-11-29 03:58:22 1IxgA0-0002Gs-Vb Completed
It looks like Exim doesn't know that emails sent to info@foo.com.np should be a local delivery. I checked the file "/etc/vdomainaliases/foo.com.np" and it says:

Code:
foo.com.np: foobar.com.np

So that should be correct...

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Apr 27, 2007

I installed Oracle via aptitude on Ubuntu.

Everytime I try to access a PHP script with Oracle on it, I get this message:

Quote:

Warning: oci_connect() [function.oci-connect]: OCIEnvNlsCreate() failed. There is something wrong with your system - please check that ORACLE_HOME is set and points to the right directory in /path/to/file.php on line 215

This was on PHP 5.

In my attempts to resolve this problem, here is what I did.

I tried the following with oracle-xe running and while it had been stopped:

Code:
$ . /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/oracle_env.sh

and I saw this message:

Quote:

/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: 114: [[: not found
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: 114: [[: not found

and here is /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh:

Code:
103 # Detertmine the LANGUAGE_TERRITORY part of NLS_LANG
104 # we derive it from the current locale by inspecting the LC_ALL and
105 # the LANG environment variable. Other LC_* environment variables
106 # are not inspected.
107 #
108 if [[ -n "$LC_ALL" ]]; then
109 locale=$LC_ALL
110 elif [[ -n "$LANG" ]]; then
111 locale=$LANG
112 else
113 locale=
114 fi

I then opened /etc/bash.bashrc and
tried adding this to the bottom:

Code:
LC_ALL='en_GB'
export LC_ALL
and sourced it but that did not work so I replaced it with this:

Code:
LC_ALL='C'
export LC_ALL
and sourced it but still no luck.

Does anyone know how I could sort this out?

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Feb 22, 2007

My server running mailenable is possibly sending out spam because ive had a returned mail saying my IP is on a blacklist at CBL.

IP Address 64.X.X.10 was found in the CBL.

It was detected at 2007-02-17 13:00 GMT (+/- 30 minutes), approximately 5 days, 5 hours, 30 minutes ago.

However when i checked my smtp and pop logs i only see small ammounts of mail thats been delivered.

When I run the netstat command have the following connections. The ones to the .nl domain looks strange

C:Documents and SettingsAdministrator>netstat

Active Connections

Proto Local Address Foreign Address State
TCP server:telnet server.indis.nl:3409 CLOSE_WAIT
TCP server:telnet server.indis.nl:3410 CLOSE_WAIT
TCP server:epmap dsl10-037.express.oricom.ca:2253 ESTABLISHED
TCP server:1121 ipchicken.com:http CLOSE_WAIT
TCP server:1122 ipchicken.com:http CLOSE_WAIT
TCP server:1136 ipchicken.com:http CLOSE_WAIT
TCP server:1138 ipchicken.com:http CLOSE_WAIT
TCP server:1199 ecostumeshop.com:domain ESTABLISHED
TCP server:telnet server.indis.nl:3326 CLOSE_WAIT

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I kept getting multiple requests/second for a document that is non existent from different IPs.

From the way I see it, it is a mild DDOS.

access_log

221.208.181.38 - - [13/Nov/2008:03:11:00 -0500] "GET /testtxt.txt HTTP/1.1" 404 2088
218.26.203.79 - - [13/Nov/2008:03:11:00 -0500] "GET /testtxt.txt HTTP/1.1" 404 2088
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I am now wanting to move to a dedicated server HOWEVER I DO NOT WANT TO START ALL OVER AGAIN. The site is rather busy and it is important to do the transition as fast as possible.

SO -- I have used Symantec Ghost before to "clone" a computer before. It basically takes an IMAGE of the entire HD and then you can paste/burn that image on a new HD and it makes a PERFECT copy of the original machine.

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Mar 9, 2007

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hostname: Unknown host

Some guides talk about setting a hostname but I dont have a domain name just an IP Address.

Then depending on what guide I look at there are references to different files. So I am not sure which file to edit.

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Oct 31, 2009

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IMPORTANT: Do not ignore this email.
The hostname (example.mydomainname.com) resolves to . It should resolve to 208.53.183.125. Please be sure to correct /etc/hosts as well as the 'A' entry in zone file for the domain.

Some are all of these problems can be caused by
/etc/resolv.conf being setup incorrectly. Please check this file if you
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You may be able to automaticly correct this problem by using the
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in your Web Host Manager

1) Within WHM, I have the following:

-Add an A entry for your hostname (I only have one listed)
Hostname: example.mydomainname.com
Server Main Ip: 208.53.183.125

-Primary/secondary nameserver
Primary Nameserver: ns1.mydomainname.com (A entry = 208.53.181.26)
Secondary Nameserver: ns2.mydomainname.com (A entry = 208.53.181.27)

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Secondary Resolver: 66.90.68.26

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208.53.181.26 (used in primary name server)
208.53.181.27 (used in secondary name server)
208.53.181.28

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example.com (my website URL that is currently working)
example.mydomainname.com (hostname I made myself that contains the server main IP)
ns1.mydomainname.com (A entry = 208.53.181.26)
ns2.mydomainname.com (A entry = 208.53.181.27)

2) My edit "edit /etc/resolv.conf" contains the following:
Search localdomain
nameserver 66.90.68.25
nameserver 66.90.68.26

Issue: I receive daily email notification that "example.mydomainname.com" does not resolve to any IP. However, when in WHM, it already contains Server Main Ip: 208.53.183.125.

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Then...

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I can't even find anywhere where abc.example.com is listed within the WHM. All the new values are listed... so, where is it pulling this from? I thought the reset of the server (as a graceful reboot) would resolve this issue.. it hasn't. I've rebooted twice and awaited the thirty minutes for everything to get back online. No success.

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Quote:

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I have cPanel on a CentOS 5.1 VPS

I am still pretty new to CentOS

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SMTP error from remote mail server after end of data:
host mail1.**.com [**.**.***.**]: 557 Your domain sun.***.net does not have a valid MX DNS record.
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"
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