Client reports website down for some users, not all

Hi all – my client is reporting that their site access hosted on a DreamPress Dreamhost account, is not reliably showing as online to their visitors.

Their visitors are reporting that just their website ( is down while all others are functioning.

Our client experienced similar behaviour, but when we checked instantly at our offices in the UK, Germany and Italy, all could see without issue.

What could be causing this, as our client is concerned about the service that we are providing them by using Dreamhost.

Many thanks in advance.

Additionally, you can always recommend that they use a site like Down For Everyone to see if the site is actually down, or if they just can’t access it. Here’s a list from Google.