Reverse DNS - Which Hostname

Apr 13, 2007

I have a VPS with the hostname, with four IP addresses, one of which is assigned to a shared hosting account (using WHM/cPanel) at

For email delivery purposes (I'm sending e-commerce receipts (that MUST be delivered) from PHP apps running on, do I need to set up reverse DNS entries that say their IP addresses belong to, or to

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Plesk 11.x / Linux :: SMTP - Reverse DNS Is Not A Valid Hostname

Jun 11, 2015

I use PLESK 11 on one of my servers, and use NS.mydomain & NS1.mydomain, everything works fine, DNS Zones are OK, reverse DNS is OK...

Except on MXTOOLBOX this :

SMTP Valid Hostname > Reverse DNS is not a valid Hostname
SMTP Reverse > DNS Mismatch OK - 195.154.XXX.XXX resolves to
SMTP Banner Check > OK - Reverse DNS matches SMTP Banner

Tried so many searches on Google, but no response and always 3 same pages from MXTOOLBOX.

I migrated IP of this server in datacenter, because they ask us to do it, so in /etc/hosts for example I found old IP, I changed it, restart network interface, but always the same thing... postfix too (changed IP and restart).

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Reverse DNS

Oct 23, 2008

is this the proper forum to ask for help with a reverse DNS issue on my co-located server?

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How To Set Up Reverse DNS?

May 24, 2008

i have a dedicated server with 2 ips and i am planning to run a nameserver, mailserver and webserver on the same server. i heard that reverse dns is important. how do i do that?

My questions are...

1. will it work if i setup the reverse zone in my server? or should i ask my host to setup reverse ip for me?

2. Do i have to setup reverse entry to mailserver or domain or nameserver? which is important to have reverse ip.

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DNS Reverse

Jun 9, 2008

i had some problem with my smtp server because of my PTR record

i create a new reverse zone and add a ptr record point to my from my ip(

but when i check it from online tools, all of them except say me that my server has no ptr record.

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Reverse DNS

Apr 2, 2007

I'm with a German (dedicated server) Provider and have the ability to personalize the Reverse DNS settings through their CP.

No US provider had allowed me this setting before, so I'm clueless about it. Whats Reverse DNS, what if I change the current setting to like - Whats the use?

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How Does Reverse DNS Work

Jul 22, 2009

some clarification with regards to Reverse DNS.

An example ip: is owned by A Company via a DC. The they have their name allocated to the netname and description when i look up their ip address.

I have my ip this is me and it currently contains my DC's name throughout when i look it up as the description and netname...

Both are from the same DC however the other company has their name allocated to the ip address and i would like to do the same. Does this require Reverse DNS? It dosent involve domains surely does it?

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Reverse Proxy

May 26, 2009

if my main site hosted in usa and reverse proxy server located in UK or Canada. will my site load still quickly or be slow dramtically? both use linux and apache. or canada user will quickly load my site or still slow? how about usa customers?

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Vps Reverse Proxy

Jun 7, 2009

Is possible to config a reverse proxy to connect with the website(hosting at bluehost) in VPS?

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Reverse DN For DNS Server IP

Nov 2, 2009

I was issued two IPs for my DNS server.My DNS server is up but when a domain is using the new dns server.I did a dns check and was told there is no reverse dns.Can I do it myself by setting on the DNS server or I need to get my ISP who provide me the IP to do it set the reverse dns?

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How To Set Up Reverse DNS On My Server?

Jul 18, 2008

how to set rdns manually on dedicated server?

i dont have rdns control to set.

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DNS Provider With Reverse DNS

Mar 10, 2008

Who are the DNS service providers that offer reserve dns setup.

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Reverse DNS And PTR Records

Dec 7, 2008

We recently decided to move all our DNS to a service called DNS Made Easy and also our sever box. We setup what they call Vanity DNS with and so our clients did not have to change their nameservers.

Our records for all domains are now setup and looks like they are beginning to propagate. Here's where the question is:

IP - is for domain1
IP - is for domain2, domain3 and domain4
IP - is for domain5

All domains have MX records pointing to a either Google or Mailtrust.

what is the best way to setup Reverse DNS and PTR's for this setup and what should we ask our ISP to do for Reverse DNS in this case.

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Reverse DNS Lookup ...

May 5, 2008

if I do a reverse lookup on my server's IP it returns a host assigned by the data center. So is this something I should even be managing too or is that always left up to the DC? I run my own DNS for the forward lookup zones.

Also just a technical question, when you do a reverse lookup, how does it know where to look to get the host? I'm not sure I fully understand how these work.

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Reverse Domains

Mar 9, 2007

what are the techniques used to find out the domains pointing to a particular IP?

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Jun 26, 2007

I am having trouble pinning down exactly what I am doing wrong with reverse DNS at on a /27 subnet.

Example host:

It looks to me like has properly deligated the subnet:

# dig -x


And I have the zone file on both of those servers. But still won't resolve from outside coming in.

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Reverse Proxy To What

Apr 30, 2007

I researched a few options and have come to this conclusion use Ultramonkey (LVS + HA Proxy) -> apache2 mod_php/ mod_python (serve php / python)
-> lighttpd (serve static files)
-> mongrel (ruby server)

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Apache :: Reverse DNS And PTR

Sep 17, 2013

I am trying to do Reverse DNS and PTR of my server, but it the documentation from cpanel.I followed the Documentation till Editing the Reverse DNS Zone from here. URL... My Server has IPv4, the problem is the First and the Third Step, and in that result image shown on cpanel site, it has shown like 1 , 2 ,3 so Do i have to write their 123 in even in my cpanel or write the IP or reverse IP.

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APF Hostname

Mar 9, 2007

Installed APF on a Fedora Core 6 box, had a problem with one of the modules (Unable to load iptables module (ipt_multiport), aborting) which was sorted by editing the functions file.

But I now get this come up 30 times when I start the firewall:

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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Reverse Proxy Server

Oct 3, 2009

a simple reverse proxy server but with good re-write rules engine.

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How To Protect Reverse IP Information

Apr 10, 2009

is it way to protect Reverse IP information ?

I mean someone can't see friend sites in same vps/server.

This is my domain ( godaddy )

And another domain ( not me )

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Reverse Proxy And SQL Injection

Jun 30, 2009

Does deploying a reverse proxy in front of the web/db server reduce the threat of SQL injection?

Emphasis on 'reduce' the threat - or does it provide no help at all?

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Apache2 Reverse Proxy

Apr 26, 2009

I have a mobile email application (for Zimbra) that is not compatible with HTTPS, only with HTTP.

Is it possible to configure a Reverse Proxy so I can bypass the SSL? Something like this:

[url]<-> REVERSE PROXY <-> [url]

I was able to configure a Reverse Proxy but when it comes to https, something does wrong! here is my vhost config:



<VirtualHost *>
ServerName mail

ProxyPreserveHost On
ProxyVia full
SSLProxyEngine On
ProxyRequests On

<proxy *>
Order deny,allow
Allow from all

ProxyPass /
ProxyPassReverse /


I have all mod_proxy modules (and its sub-mods) load. If this is possible to achieve, I think it's only a manner of configuration lamess.

Have someone configured anything like this before?

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How To Setup RDNS (Reverse DNS)

Apr 2, 2008

I was wondering if anyone could assist me on how to setup RDNS?

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Changing Reverse Dns Records

Feb 18, 2008

I signed up for a dedicated server this weekend.

I'd like to know if its possible to change or even delete the reverse dns record from
the ip address from my server ?

Is it possible to hide the "dig -x ip" results?

I don't want them to know in which provider i am....

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How Do I Check If I Have Reverse DNS PTR Set Up Properly

Nov 7, 2008

As title suggests I'm looking to make sure my hosting is set up to respond with valid PTR information so my server generated emails aren't flagged as spam.

I have full SSH access to the machine at root level.

Running a CentOS machine but there are also other virtual hosts using a shared ip.

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No Reverse DNS=lost Email

Jun 11, 2007

I have a client coming to me from another provider. Their biggest problem currently is that many emails either vanish or some get emails while others don't.

I did a check on DNS Reports and found that the domain is on a shared IP address (800+domains) whereas its mail server points to another IP address. Neither of the IP addresses appear blacklisted in any spam databases. The only possibility seems to be the IP address for the web site which does not have have a PTR record (reverse DNS record).

Could this be why the emails are disappearing? They have even configured SPF for the domain etc. I would like to avoid facing a similar situation when the client moves to me.

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Hostname Does Not Resolve To Any IP

Oct 31, 2009

I hope your day is going good. I've been trying to fix a problem I had all week. I receive daily email notification that "example.[url]" does not resolve to any IP. However, when in WHM, it already contains Server Main Ip: I've tried a few solutions from the web, but to no avail:

IMPORTANT: Do not ignore this email.
The hostname ( resolves to . It should resolve to 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
believe everything else is correct.

You may be able to automaticly correct this problem by using the
'Add an A entry for your hostname' under 'Dns Functions'
in your Web Host Manager

1) Within WHM, I have the following:

-Add an A entry for your hostname (I only have one listed)
Server Main Ip:

-Primary/secondary nameserver
Primary Nameserver: (A entry =
Secondary Nameserver: (A entry =

-Resolver Configuration
Primary Resolver:
Secondary Resolver:

-Additional IP my webhost gave me to use: (used in primary name server) (used in secondary name server)

-Current DNS Zone listing: (my website URL that is currently working) (hostname I made myself that contains the server main IP) (A entry = (A entry =

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

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

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WHM Keep On Asking For A Record For Hostname

Apr 5, 2009

Here are the scenarios :

1. This Dedicated Server don't have main domain name but I use something like for the hostname.

2. The nameservers I use are something like and which I registered it already on my domain registrar.

3. is use on other Dedicated server

Are these kind of setup okay? or should I really changed the to something else that is hosted on the same server?

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Hostname Shows (none)

May 7, 2009

I have a server with RHEL 5 installed. The problem is that the server shows the output of the hostname command as (none). I checked the /etc/sysconfig/network file and it shows the correct hostname. I also tried to change the hostname in the /etc/sysconfig/network file and restart the server. But hostname command still shows (none).

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Hostname, Nameserver WHM

Oct 2, 2008

I have a dedicated server with WHM 11.23.2. I am in the process of "attempting" to change the hostname for a group of websites and also the nameservers.

Let's say for practical senses that these were the old details:
Nameservers: and

I changed in the following sections of WHM..

Server Configuration -> Basic cPanel/WHM Setup -> Hostname to

and then...

Networking Setup -> Hostname to

and then...

Server Configuration -> Basic cPanel/WHM Setup -> Primary Nameserver to and then...

Server Configuration -> Basic cPanel/WHM Setup -> Secondary Nameserver to


Networking Setup -> Nameserver IPs. I deleted the old ones and created the two new ones: and

I have double checked that this information is still there. Obviously is listed as a domain/account. However, was naturally the first one associated with this server.

I performed a server reboot, apache reset etc.

This was three days ago. I assumed it had all changed over. Until I (stupidly) remembered that I hadn't changed the goDaddy information to point to these new nameservers. I panicked thinking all the sites (six of them) would be down. However, they weren't. When I tried to change the nameserver information for a domain in goDaddy it came back with errors... it would only accept and

So, I did a tracert to the IP address of the server and indeed it comes back as Every domain is associated with that static IP.

I can't even find anywhere where 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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