>>>What is 'Dell search' ? I don't have such thing on the website.
>>
>>That's the default page when the page is not found. I don't remember exact wording, but I think it's something related with Dell. Next time I'll get it, I'll post the header here, if you'd like.
>
>It's something on your side not mine. Maybe proxy, firewall or antivirus?

Hard to say, actually. But I remember once when I had troubles accessing your site I asked few other people to check and they all had the same problem that time.

Could it be when you're updating one of the pages the site becomes unaccessible?

I really don't know what exactly should I check here.