Hi All,

General question first. When a user accesses a site for the first time, dose the request for the nameserver go through the company registerred with ? (I guess it must)

Reason for this question is because one of my client's sites is getting about 2000 hits a day, however some users cannot access the site sometimes, this happens randomly. Could this be an issue with my client's company that registered the domain for him ? Or is it most likely my webserver that's getting overloaded ?

Thanks for any help, not sure if my question is clear.

- Your question is not really clear, however I try to clarify how DNS works. If user tries to access any site for the first time it always ask from the Nameserver configured in his pc. Most of the time it might be his ISP DNS servers. Let say his/her ISP DNS doesn't know the resolving IP for the domain, it asks from DNS server level above. As you can see it's a hierarchical architecture until it reaches root level DNS servers. So it's nothing to do with the company originally registered the domain name. However if you change the primary nameserver of the domain itself (Via domain registrar) it might take at few hours to 48 hours to fully propagate the DNS entries around the globe.

Please read following to get some understanding how DNS works - http://www.howstuffworks.com/dns.htm
More detail explanation (Seems very good, eventhought it's mircrosfot ) - http://technet.microsoft.com/en-us/l...8WS.10%29.aspx

- I don't think it's anything to do with the client's company that registered the domain. Generally 2000 hits per day is not a threatening figure. My guess is the limitation of your webserver or how it configured or memory allocated to the webserver itself.

In order to give you a proper explanation I would like to know following,

What type of webserver is running? (Apache, IIS, nginx ...).
How much memory allocated to the webserver?
Sample webserver configurations.


Thanks

You'd have to provide some proof that you can't resolve a FQDN to an IP before you go suspecting the world of nameservers. There millions and millions of nameservers out there.

If you are talking about one of the places that host a few thousand sites then I'd suspect that the name is resolving but the demand on host systems are causing this delay. They sell 100 units of system but only have 10 units of system actually hoping that all 100 isn't needed at the same time.

I'm running Apache on CentOS. I'm using Parallels Plesk.

I have 2GB ram on virtual machine

1 CPU

Ram usage right now is only 8%

I appreciate the help. Thank you so much.

What's your /var/log/httpd/error_log looks like when you are hitting occasional failures? This will probably tell you where to look at.

Thanks