Intermittent Domain Name Server (DNS) Problems
May 2, 2006
My employer hosts a website for a company that has a .co.uk site and a .com site. The .com site generally cannot be accessed but the .co.uk site can always be accessed. Both sites are on the same server (which we maintain), but an outside company hosts the DNS records and refuses to admit there is a problem.
Since one domain is accessible and one isn't and they are both on the same server I'm pretty sure it's a DNS issue. I did a report on www.dnsreport.com and it says there are lame nameservers on the .com domain, but the .co.uk domain doesn't show that issue.
Am I on the right track with lame nameservers?
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Apr 12, 2008
I'm having problem with godaddy shared server. I've signup with godaddy since 2006. Within the 2years, godaddy has been having so many downtime. Replies from them were always pointing faults to my internet service provider, but everytime I could serve other websites with ease.
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Mar 9, 2007
I started getting small periods of intermittent connection errors about once every hour, lasting for about 1 to 5 minutes each time:
Can't connect to local MySQL server through socket
'/var/lib/mysql/mysql.sock'
I enabled the error log and did some other monitoring and established 2 things:
- the server doesn't crash/restart, it keeps running throughout the errors
- the errors do not match the load on the website, as sometimes when 500 users are online there are no errors, but when 300 are online they may by prolific
I checked many forums and then made 5 changes:
- changed the directory containing the mysql.sock file so only file owners or superusers can delete files from it
- I changed the default socket file setting in both my.cnf and php.ini
- I read about SELinux causing such a problem, so I disabled SELinux completely, rebooted the server and double-checked that it is indeed disabled.
- I changed the maximum amount of open files allowed by the operating system from 1024 to 30000.
Despite all these changes, I still get the errors. I then read that there is a workaround by using TCP/IP instead of the sock file. I tried that, but I still get the error intermittently in the form of:
Can't connect to MySQL server on 127.0.0.1
MySQL server 4.1.20, PHP 4.3.9, client API 4.1.20, CentOS 4.3, Intel P4 2.8GHz 1GB RAM
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May 9, 2008
my vBulletin forum members start complaing about an intermittent forbidden error message:
Forbidden
You don't have permission to access /vb/forumdisplay.php on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request
i did tail -f /usr/local/apache/logs/error_log and find lot of lines like this:
[Fri May 9 17:13:33 2008] [crit] [client 217.69.189.2] (24)Too many open files: /.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
i also found the vb folder and all folders inside it have permession of 775 and all files have permession of 664
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Nov 16, 2006
We are running RHEL4 over at Rackspace, customers are experiencing occasional timeouts when browsing https
Firefox reports:
The connection has timed out
The server at mydomain.com is taking too long to respond.
I have had this happened to myself while I had an SSH session on the server and nothing appears in any of the logs (checked all relevent)
http is still browsable at the time and my SSH session did not drop.
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Nov 5, 2014
We are hosting a Git server (using Gitolite v3). Our users are interacting with git over an https connection. Here's the relevant versions of software:
Apache 2.4.6
OpenSSL 1.0.1e-fips
Red Hat Enterprise Linux Server release 6.5 (Santiago)
git version 1.8.5.3 (Server Side)
git version 1.9.2.msysgit.0 (Client Side)
Users sometimes encounter an SSL error message when attempting to run git commands that talk to the server (e.g. clone, push, pull). The error message is "Unknown SSL protocol error in connection to servername:443". Users can usually simply try the command again, and it will then work successfully.
I've managed to capture a bit more output by setting the GIT_CURL_VERBOSE flag, see output below.
Code:
* Couldn't find host servername in the _netrc file; using defaults
* Adding handle: conn: 0x2587c40
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
[Code] .....
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Oct 27, 2006
Hi there,
Firstly, I want to say that I signed up with Softlayer because I heard they had better support than EV1. If that's the case, EV1 must be really horrible.
That being said, I've had an issue with my server every since I got it from them a few days ago. I moved a bunch of high traffic sites that use PHP and MySQL on a dual core dual processor server with 2 gigs of ram and a scsi 10k disk.
It is running Plesk 8 (which I theorize 'could' be the problem).
I am not stating it is a hardware problem or a software problem because I have no idea what the problem is. Here are the symptoms:
- Every few minutes all my PHP and MySQL sites begin to run very slow. It takes about 10 seconds before a page is loaded.
- During this time, sites that do not use MySQL and PHP seem to run fast, but perhaps a little slower than normal.
- When i attempt to log into SSH during these moments, it pauses on the screen with the black cursor and waits and takes about 30 seconds to log in.
- When I log in, or when I am already logged in and I view the load and memory usage during these times, there is no correlation between the cpu usage or memory usage and the slow downs
- They occur all day and all night.
- When these moments do not occur, the sites are all blazingly fast.
- Load is rarely ever above 1
- I have MySQL and PHP running on the same box.
- I have disabled any possible Plesk cron jobs including drweb and the backup cron that runs every 15 mintues. However, I have manually run it and tested the server and it does not cause any slow down.
- One cron job I have on one of the sites I host (http://www.perfectpeople.net) updates a new image every 25 minutes. This certainly does not cause the problem, and recently two images have shown up not found but the db is updated so you see that image not found error. This has never occurred before and I theorize this is the result of the same issue.
---------
None of these issues occurred with any previous servers. Softlayer techs keep telling me everything is fine, repeating over and over that it loads fine on their side, being completely unhelpful.
Some notes to avoid pointless responses:
1. If other sites load fine, and ping is fine, it is not a bandwidth or traceroute issue.
2. If CPU and memory usage is fine, it is not a load issue.
---------
The only thing I can theorize based on my limited knowledge is that it could be a hard drive seek. I do not know if that will cause SSH connections to slow down and PHP and MySQL.
Any help would be greatly appreciated.
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Nov 16, 2014
When I hit my server's domain it redirects me to one of the hosted sites' domain with a 302 redirect. It used to return the default plesk server page. How can I cancel the redirect?
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Nov 5, 2008
We have a lot of unused domains that we'd like to setup domain parking for.
To keep it simple, we'd like to just change the namesevers to ns1.domainparking.com and ns2.domainparking.com (not real nameservers!) and the domains would then automatically show a simple web page.
We use cpanel servers and are wondering how easy this is to do? I've seem mention of wildcard dns? Is that the answer?
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Aug 3, 2007
i have about 8 different domains i'd like to point to a nameserver (ns1./ns2.mydomain.com) on Win2k3 server, but i can't get them resolved through my nameserver without creating a manual forward lookup entry for each *parked* domain separatly..
Does anyone know how to resolve "parked" domains automatically on Win2k3 DNS??
I just can't find any answer for this, everything i've found required manual creation of lookup entries..
anyone?
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Jul 6, 2007
I have a vps with dedicated ip's for my domain names.
I read that in order for mails coming from my server not be picked up as spam, i need to add reverse ip entries.
Now i have already added the glue nameserver records on my godaddy control panel,
ns1.mydomain.com -> 10.20.30.40
ns2.mydomain.com -> 10.20.30.41
But do i need to speak to the datacenter to add the reverse dns entries for my domain on their nameservers? What about if i host my nameservers offsite, but then have my webserver/mailserver etc inside the datacenter? Would i need to request the datacenter where the nameservers are hosted to add the reverse ip entries for the domain, and then the request the same from the datacenter for my web/mail servers to add the reverse entries?
Is it really required?
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Aug 14, 2008
I've been having some DNS problems with one of my domains for quite some time now. The domain does not always resolve - some go days without being able to access the site.
I ran a simple BASH script to show what I mean. I replaced my domain with "mysite.net" and the IP with "xx.xx.xxx.xxx".
# for i in `seq 1 15`; do host mysite.net; done
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
Host mysite.net not found: 2(SERVFAIL)
mysite.net has address xx.xx.xxx.xxx
Host mysite.net not found: 2(SERVFAIL)
mysite.net has address xx.xx.xxx.xxx
Host mysite.net not found: 2(SERVFAIL)
mysite.net has address xx.xx.xxx.xxx
Host mysite.net not found: 2(SERVFAIL)
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
Host mysite.net not found: 2(SERVFAIL)
Host mysite.net not found: 2(SERVFAIL)
mysite.net has address xx.xx.xxx.xxx
Host mysite.net not found: 2(SERVFAIL)
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
Host mysite.net not found: 2(SERVFAIL)
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
mysite.net has address xx.xx.xxx.xxx
mysite.net mail is handled by 0 mysite.net.
Has anyone experienced a similar problem? I have gone over the DNS records countless times and see no problems. The site is hosted on my own dedicated server.
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Jan 26, 2009
I´ve a domain but haven´t set the DNS servers yet....now I get a free hosting and I wanted to associate the DNS servers to my domain but I don´t know how!!!
It would be great If you could help me...and let me know if you need more info..
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Nov 7, 2009
This is the scenario, domain.com are setup on server1, however server2 also has the same profile of domain.com as we use ns3 and ns4 using domain.com. This works fine with the nameserver setup on server2.
However I encounter problems as the emails from server2 won't reach server1 as there are duplicate profile on server2.
My question is how do I setup the DNS in cpanel/whm from server2 so the emails from server2 will reach server1?
Server1 (www.domain.com)
ns1.domain.com
ns2.domain.com
Server2
ns3.domain.com
ns4.domain.com
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Aug 28, 2009
I have been searching everywhere trying to find a tutorial but It is not going anywhere. Basically I need to create 2 nameservers for Godaddy and pretty much so when i type http://mysite.com it goes to my site. I can access everything from http://myip and everything works. Now is there a step by step on how to actually do it in the DNS Manager? I need help like what IP address do I use is it the router ip? The external IP?
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Oct 20, 2007
i am currently with a host, hosting my important sites. I am now going to purchase some space from another host purely for storage purposes and bandwidth usage as they are within my budget.
Now i have my primary domain with my main host, and i would like to have a script or link from my current host which leads onto my 2nd host for users to upload their images or files. Now i have a problem, the second host that i will have will not have a registered domain attached to it, but rather it will be just storage.
I would prefer to have a subdomain from my primary host pointing to my second host. The problem is where will the subdomain point to? Or will it even work that way without having to purchase another domain?
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Sep 16, 2006
I have 1 server so I setup dns as ns1.mydomain.com, ns2.mydomain.com ip address pointed to server1. So, now I just bought another server. Can I setup ns2.mydomain.com pointed to 2nd server. Also how to setup more servers ie. 10, 20 server because I can only set up to 6 dns in one domain name.
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Jul 21, 2008
Could someone tell me what I need to change in the DNS zone for when moving servers, to minimize downtime
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Mar 6, 2008
i had searching in this forum and in google How to set Subdomain to other server, i had try some of methode but still not working, because i cant set A Name in godaddy, because i use other webhosting outside godaddy
i just have ip address from my other server, i want subdomain to go this ip address, for example 10.42.1.21
what is your experience in godaddy, how to set Subdomain to other server, please give simple step by step dude
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Oct 11, 2006
I got Problem with DNS , Some time it's work the sites on the server some time it's not
The report From DNS:
ns116.***********.: Parent server (k.gtld-servers.net) says A record is 72.232.232.133, but authoritative DNS server (72.232.232.132) says it is 72.232.232.131
ns115.***********.: Parent server (k.gtld-servers.net) says A record is 72.232.232.132, but authoritative DNS server (72.232.232.132) says it is 72.232.232.130
ns116.***********.: Parent server (k.gtld-servers.net) says A record is 72.232.232.133, but authoritative DNS server (72.232.232.133) says it is 72.232.232.131
ns115.***********.: Parent server (k.gtld-servers.net) says A record is 72.232.232.132, but authoritative DNS server (72.232.232.133) says it is 72.232.232.130
The DNS on the server :
72.232.232.132
ns115.***********
72.232.232.133
ns116.***********
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Sep 28, 2006
I am fairly sure this is impossible, but I figured I'd ask anyway.....
Right now I have a forum setup at http://support.myhostingcompanydomain.com/forum/ and I would like to move the forum to another server on another network, so I'm wondering if its possible to have
http://support.myhostingcompanydomain.com hosted on one server and
http://support.myhostingcompanydomain.com/forum/ hosted on another?
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Mar 4, 2007
I currently have two VPS servers, each with 2 DNS names running on them as follows:
dns1.mydomain.com (on Server A)
dns2.mydomain.com (on Server A)
dns3.mydomain.com (on Server B)
dns4.mydomain.com (on Server B)
I have websites running on each server and I would like to have something set-up so that when one server goes down, the other server displays a nice page saying the website is unavailable currently and will be back shortly - you know, something nicer then the normal "Server Not Found" default messages.
What is the best way to do this?
If I have CLIENTDOMAIN.COM and put them on Server A and they use all 4 DNS server names, will the top two DNS names always be used by people finding the website, and the bottom two choices only be used if the top two can't be found?
I believe I have to create an account on Server B for them as well, just only placing the temporary page within the account, rather then a whole copy of their website. Correct?
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Aug 15, 2006
i'm looking to build a site, but i'm stuck somewhere, they say you have to update your DNS, where do i find that or what do i do?
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Jun 26, 2007
Looking for a vps for dnsonly cpanel
around 600 zones for now.
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May 21, 2008
There are few clients complaining site inaccessible but it could be accessible from other location.
Does this mean that the client's is resolving to the down DNS server? Any fix on this to force the client to resolve to the main DNS server?
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Nov 16, 2006
Im trying to get my hosting going but i relised i need a name server for domains. I have no idea how to do any of this. What i want is to be abel to point name server to my server and then direct where it should go. Im running windows 2003 server on it.
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Dec 2, 2008
DNS Server?
What exactly is it? I'm quite confused with it..
Is it a must to have? How does it work?
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