Just got set up with a new VPS and while looking to see if my IPs were blacklisted, I came across a RDNS warning. I've been on some form of shared hosting since I've been on the Internet, so much of the VPS stuff is new to me (though it is managed). Everything I've read says that RDNS is important for sending mail so the receiving end can verify where mail is coming from, but I thought I would ask here regarding my specific issue.
I've got four IPs on my account. The first ip, x.x.x.67, is the host IP(ie host.example.com). Most of my domains are using that IP at the moment since I just got set up, but I do have another domain on the last IP in my account, x.x.x.70. When I first did a RDNS check on my main IP I got a domain that I've never seen before, and all other IPs on my account don't resolve at all.
I sent a ticket off to the host, and they set the RDNS record correctly for the main IP on my account, but the other three still fail to resolve. When I asked the host about it in a ticket, the response that I got was
Quote:
Normally, we set RDNS for the main IP address to hostname of the server.
The RDNS for your server has been setup properly. Please get back to us if you need any further assistance.
So basically I'm clueless. Does it matter that the other three IPs I have available don't resolve at all? The domain on the x.x.x.70 IP, which doesn't resolve, is an e-commerce site that depends almost exclusively on e-mail for its business. Doesn't the lack of RDNS resolution mean that I'll be out of luck sending mail to AOL, Yahoo, Hotmail, etc etc on that account? Even though I don't have sites on the middle two IP addresses yet, I fully plan to put sites there within the next couple of months... could they have the same problem?
It's frustrating since I obviously have no control over RDNS records, and the host's staff is being a little obtuse about it.
i cant sent emails to Hotmail from my domains so make a Spam Database Lookup from dnsstuff for my main ip 72.249.101.164 here are the results "72.249.101.164 has no reverse DNS entry; some mail servers may not accept your mail." and i also not listed to any database.
Can someone check the and tell me if
- RDNS are ok
- and if this spam databases include Hotmai spam databases?
My hosting provider tell me that RDNS are ok and that Hotmail black listed the server IP
I have Comcast Business PRO Internet service for work purposes. I've got two web/dns servers and two mail servers, each having their own IP. These are all fine.
There had been a couple situations in the past where I would receive a "Relaying Denied" message from my PINE when sending mail out. At examination of the maillog, It's essentially telling me that these messages are being generated because of the lack of reverse DNS.
xxx.xxx.xxx.xxx-Oregon.hfc.comcastbusiness.net., instead of my.domain.com.
I did a couple searches on Google, and read somewhere that Comcast is unwilling to create rDNS entries, but they've not specified, so far, whether they subscribe to PRO or residential service.
Before I spend 90 minutes on the phone with Comcast, I thought I'd see if anybody here has been successful with rDNS and Comcast PRO before. It seems to me that by denying this, it defeats the purpose of the "dedicated" service that I signed up with ...
I set rdns by contacting the dedicated server host. I am switching to a colo environment soon, do I still contact the ISP who issues the IPs for the rdns requests or can I set them myself somehow on my servers?
If I eventually get my own IPs through ARIN, how do I set rdns? Do I just get some script to set the PTR records on my own servers?
I have two ISP lines coming to my router which is connected to a Exchange mail server. Both ISP has given me dedicated IP addresses such as:
ISP1 = 217.105.25.94 ISP2 = 62.15.125.44
Now my ISP1 IP address has a reserve DNS set and when the mails are send via this line no problem, but my ISP2 IP does not have a reverse DNS so some mails are bouncing back due to the face the receiving mail server is checking the IP against the DNS.
How can I solve this issue, or normally who can set this rDNS?
We have a full rack of servers at an XO datacenter. Most of these servers consistently need to go out to the internet to retrieve various URLs. Essentially, the servers are spidering, like Google does.
Lately we have noticed that the DNS servers that XO provided, which are in the /etc/resolv.conf files for each server, have been randomly failing.
Is there any reason that I can't set the servers to go to the root and use that for DNS? I need to bypass the XO DNS servers some how.
One of the options that I am considering is setting up a dedicated server that can provide recursive DNS to my other servers and have that server ask the root DNS system for records when it is not in the cache.
The other option that I am considering is finding a company that I can buy the ability to do recursive dns on. The onyl one that I have found so far is DynDNS though, and I have been looking for about two hours.
[url]
If anyone can make any suggestions to how I can get around the XO issue I am having or provide suggestions to a provider of recursive DNS servers (not managed, unless recursive comes with it),
This is the output at RIPE NCC's web update interface:
***Info: Authorisation for parent [inetnum] 193.53.87.0 - 193.53.89.255 using mnt-domains: authenticated by: ITECH-MNT
***RDNS: (related to ns1.infinitetech.in, ns2.infinitetech.in) ERROR (20 points):
Could not get an SOA record from ns1.infinitetech.in, ns2.infinitetech.in (193.53.87.2).
***RDNS: (related to set) ERROR (20 points):
The IP address 193.53.87.2 is identical for the nameserver(s) ns1.infinitetech.in, ns2.infinitetech.in found in the submitted domain object.
***Error: There are 20 or more problem points. Delegation was not successful. This is what I am trying to submit:
domain: 87.53.193.in-addr.arpa descr: Reverse Delegation for Infinite Technologies admin-c: ITGR-RIPE tech-c: ITGR-RIPE zone-c: ITGR-RIPE mnt-by: ITECH-MNT nserver: ns1.infinitetech.in nserver: ns2.infinitetech.in changed: noc@infinitetech.in 20080101 source: RIPE password: secret_here Following the guide available at: [url]
Now, how do I create the SOA record on a cPanel based server? I created a new zone, rdns.infinitetech.in and now what? I don't see SOA record option at all in the drop down list!
Unless I misunderstood what an SOA record is, I have no idea how to implement rDNS. Anyone?
If any RIPE NCC member/participant is available to answer this question directly it would be awesome! Others, give it your shot - I do understand that most of you are ARIN members/participants.
my DNS stop resolving, once a day i need to restart the service in cpanel/whm , what can be done to prevent that ?
its a fresh vps only cpanel is there and 2 domains with no pages just a simple under costruction index page . in CSF i have a Your Score: 106/112 in security , it firewalled and hardened
right now is using 299 of ram out of 512 burstable to 768
i have a weird problem with dns bind. i just setup a zone file and it seems [url]works but [url]doesnt work. i have also created a cname for www but still not working.
here is my zone file
$ttl 38400 domain.com. IN SOA ns1.domain.com. webmaster.domain.com. ( 1211542287 10800 3600 604800 38400 ) domain.com. IN A 67.223.229.117 ns1.domain.com. IN A 67.223.229.117 ns2.domain.com. IN A 66.249.8.117 domain.com. IN NS ns1.domain.com. domain.com. IN NS ns2.domain.com. www IN CNAME domain.com. ftp IN CNAME domain.com. mail IN MX 0 domain.com.
I have a local server named as 'EPBX' which monitors the working of the telephone system and makes their log entries. Recently its HDD partition got crashed due to which it was formatted and had re-installed Windows server 2003 after which I am facing some problems as given below:
- The IP address assigned to this server is 192.168.100.2. I am able to ping the IP but unable to take the console of the software from some other local PC.
- Also when I try to trace the IP using the tracert command first it resolves to the ISP's router and then to the server. But the router is not at all asigned a local IP. I have assigned a global IP to it. (Screen shot of the same has been attached)
- It would be very difficult for me to change the IP address
We've just been told by our data centre that our server that we use to host our web design clients has been disconnected due to massive volumes of traffic from or to the server.
They said I will need to log into a KMV/IP in order to investigate.
I have no idea what I am doing and was wondering if there are any users out there that could give me some pointers in finding what is causing this DoS attack?
This is an issue I've been having for a few months now and haven't been able to resolve yet with my data center, AOL support and the company who manages the server for me. My main reason for posting this is for a fresh set of eyes and to see if anyone else has had a similar problem in the past (and how they fixed it)
The issue is this:
I set up a dedicated server to host my web design clients a few months back and no one has been able to send to or receive mail from AOL addresses. I've gone through everything at the postmaster.aol.com site and have ensured that reverse DNS records are in place for all IPs associated with the server, as rDNS is a mandatory requirement for AOL.
Once my support requested was finally elevated to a real AOL support tech, they confirmed that my IP was not being blocked by their servers and are still under the impression that the problem must be on my end somewhere. Because this problem only occurs with AOL (we can send/receive with all other big providers - yahoo, hotmail, gmail, hush, etc), my server management team are fairly certain it must be an issue on AOL's side.
When sending mail from an AOL address, it bounces back with an error like so (real emails replaced with example addresses):
451 <email@exampledomain.com>... exampledomain.com: Name server timeout Message could not be delivered for 2 hours Message will be deleted from queue
When sending mail from my server, it bounces back with an error like so:
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
exampleaddress@aol.com retry timeout exceeded
When attempting to manually deliver a message to AOL from the Mail Queue in WHM, I get an error like so:
Message xxx-example-number is not frozen delivering xxx-example-number Connecting to emr-d01.mx.aol.com [205.188.159.2]:25 ... failed: Connection timed out (timeout=5m) LOG: MAIN emr-d01.mx.aol.com [205.188.159.2] Connection timed out Connecting to emr-m01.mx.aol.com [64.12.136.169]:25 ... failed: Connection timed out (timeout=5m) LOG: MAIN emr-m01.mx.aol.com [64.12.136.169] Connection timed out LOG: MAIN == example@postmaster.aol.com R=lookuphost T=remote_smtp defer (110): Connection timed out
When attempting a manual telnet test from my server to AOL's mail server at , it also times out with the following:
telnet: Unable to connect to remote host: Connection timed out
The AOL support tech explained that if my server IP were being blocked, it would return messages with a block error code instead of timing out. They suggested my firewall was blocking AOL's server....but both my data center and server management company said that isn't the case.
Because I can't duplicate this problem with anyone but AOL accounts, I don't know what else to troubleshoot or look for. I know AOL is notorious for blocking IPs and most email related problems are usually for lack of rDNS, but neither of those issues are the problem in this situation...so I don't know what else to try. My server management company (PSM) and AOL (once they finally elevated me to a real tech support person), have been very patient and helpful....but we still haven't been able to identify the problem and I feel incompetent for not being able to contribute on my own. I've researched for weeks and certainly understand more than I did, but still far less than they do.
AOL did direct me to a Windows Server troubleshooter relating to UDP packet size limitations with some firewalls that could cause MX query timeouts with AOL, Earthlink and Quest...but because I'm on an Apache server...I didn't know if that could be related at all to my issues (not to mention that I didn't even know what any of that meant until I went and looked up what a UDP packet actually was. I'm still not entirely sure I understand it). Even so, I did send the information to Platinum Server Management a short while ago, but haven't heard back yet.
Anyways.... in the meantime, I thought I'd check here in case anyone else had the same issue or saw something obvious we might not be considering.
My server details are as follows. I included my data center and management company details to illustrate that people far more qualified and intelligent than myself have performed the most common and obvious troubleshooters so far:
Pentium IV 2.8GHz /1GB DDRAM /120GB EIDE HDD OS: CentOS 4.3 cPanel/WHM Main Server IP: 66.79.163.138 Example Domain on the server: vedadesigns.net
Data Center: Dediwebhost.com (awesome service & fast support) Initial Server Setup & Management: Platinum Server Management (I just can't say enough good things about these people)
I don't know much about technical details of mail servers. But i want to discuss a serious problem i am facing now. I have a reseller account with jodohost. I am not a reseller but i need this to host 20 of my own and client sites. During last few days no. of emails coming to us dropped almost 60% and suddenly i found that i was not getting emails from few of my clients. Then today i got a call from two of them and they said that all emails they were sending to me, were bouncing back.I asked them for a copy of bounced emails which they sent to my gmail account and i forwarded it to my jodohost support. This the response i got-
All of our mail servers have reverse DNS and mails are delivered. anyone not having rDNS is not able to mail much of the internet already, they really must talk to their system administrators and get reverse DNS setup.
Now they say that my clients do not have rdns at their mail servers and emails from them can not be delivered to my account.
Is rdns compulsory to send emails from a mail server these days?
But in that case i may not get emails from so many inquires?
I'm hosting a few sites with LiquidWeb (freeteams.net and laxteams.net are the big ones), who's been a terrific host, but I occasionally have some issues trying to access my sites. It occurs only occasionally (maybe 10-20 people have let me know in the past year), but with users in different locations and on different ISPs. It seems to also only occur for a couple of hours.
When they try to type in a specific domain, it won't show up in their browser (browser-independent, I've tried it in Chrome, IE, and Firefox.) However, when they try the IP address directly, the site works. I have about 4 sites on one server, all with their own IP address, and the issue doesn't affect all the domains at the same time.
LiquidWeb says it's an ISP issue (they've checked all the settings on the server, and everything looks ok.) I tend to agree with them, because when I or my users switch from using their ISP's DNS server to OpenDNS' server, it works. However, it's happened at a number of different ISPs around the U.S., including universities, which makes me think there's something I can do to solve the problem. Also, I don't want users to have to change their computer settings.
Also, while I can't access the domain in the browser, I am able to ping the domain, and it will respond.
;; ANSWER SECTION: mp3-dash.com. 14400 IN A 89.46.102.100 mp3-dash.com. 14400 IN SOA ns1.mp3-dash.com.mp3-dash.com. admin@mp3-dash.com. 2009040602 86400 7200 3600000 86400 mp3-dash.com. 14400 IN MX 0 website.com. mp3-dash.com. 500 IN NS ns1.mp3-dash.com. mp3-dash.com. 500 IN NS ns2.mp3-dash.com.
;; AUTHORITY SECTION: mp3-dash.com. 500 IN NS ns2.mp3-dash.com. mp3-dash.com. 500 IN NS ns1.mp3-dash.com.
Searching for mp3-dash.com. A record at G.ROOT-SERVERS.NET. [192.112.36.4] ...took 30 ms Searching for mp3-dash.com. A record at F.GTLD-SERVERS.NET. [192.35.51.30] ...took 158 ms Searching for mp3-dash.com. A record at ns2.mp3-dash.com. [89.46.102.75] Query timed out (interrupted after 1,999 milliseconds) Retrying... Searching for mp3-dash.com. A record at ns1.mp3-dash.com. [89.46.102.74] Query timed out (interrupted after 2,000 milliseconds) Retrying... Searching for mp3-dash.com. A record at ns2.mp3-dash.com. [89.46.102.75] Query timed out (interrupted after 2,004 milliseconds) Retrying... Searching for mp3-dash.com. A record at ns1.mp3-dash.com. [89.46.102.74] Query timed out (interrupted after 2,000 milliseconds) None of the nameservers responded correctly.
I've got a VPS account & when I connect to sites on the VPS, more often than not the browser times out. I click again & the site comes through.
I use Firefox & have tried in other browsers with similar results.
The VPS has 384mb dedicated RAM, with 512mb burstable - not much I know but...
I was wondering about possible reasons - could it be simply not enough RAM, could it be a bottleneck with the hosting company, could it be a problem in the setting up of the nameservers? What would seem more likely?
It's a shame as the tech support have been superb but it's too risky to use for reselling.
i got too many logs on Lame-server resolving i my log.
every second about 10-20.
Jul 23 11:31:33 ns1 named[15967]: lame server resolving '92-49-205-1.dynamic.peoplenet.ua.mydnsdomain.net' (in 'mydnsdomain.net'?): my.ip.add.ress#53 Jul 23 11:31:33 ns1 named[15967]: lame server resolving 'www.mydomain.com.mydnsdomain.net' (in 'mydnsdomain.net'?): my.ip.add.ress#53
so i turned of the logging and start search the web on possible reasons. However the only once i found where mostly "in case of the domain is not hosted on the server". But in my case the domains in questions are on my server and show in the log as lame server resolv.
They say it has to do with server is not authoritive for that domain.
So how i am gonna fix this?
With digs, and nslookups, i got not errors at all.
But if i try to change a DNS i got a message back from a provider saying that the domains is broken.
Pinging perform.com.co [74.86.13.172] with 32 bytes of data:
Reply from 74.86.13.172: bytes=32 time=126ms TTL=49 Reply from 74.86.13.172: bytes=32 time=120ms TTL=49 Reply from 74.86.13.172: bytes=32 time=123ms TTL=49 Reply from 74.86.13.172: bytes=32 time=117ms TTL=49
Ping statistics for 74.86.13.172: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 117ms, Maximum = 126ms, Average = 121ms
Ocassionally some users have problems to connect the their websites, they can connect to the server via browser and can ping it and tracert the server IPs fine, they can also browse domains having a dedicated IP address. But they can't connect or ping their websites from their end, basically I think the domain name is not resolving.
From our end and the rest of users everything works fine.
Once I get a complain of this type I try whatever I can do
Check to see if their IP is not blacklisted Restart named service Restart apache service But most of the time this doesn't work at all.
Exactly as the problem comes it goes, nothing I did seems to have any effect on the solution. It goes and ocassionally reappears.
Would you suggest me what would I do to find where the problem is and try to solve it.
A client recently moved one of their domains to one&one (night mare I know) he then asked us to repoint the domain name to our servers using out name servers.
We have done this and it is not resolving to our server.
The problem is that the site is no longer showing and their emails are down.
I used a domain dossier and the DNS record looks like it should be changed but I'd like some confirmation on this.
