Unable to determine IP address from host name

When i try to access the https://secure.gateway.gov.uk/ site i get the following error

Unable to determine IP address from host name for secure.gateway.gov.uk/

Does anyone have any ideas what could cause this?
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This is a DNS issue. Try using flushing your DNS settings.

Try running:

ipconfig /flushdns

in your windows command prompt.

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davidrichardsonAuthor Commented:
I ran the ipconfig /flushdns on the server, still no luck
Do you have  this a problem with other web sites, or only with this one?
davidrichardsonAuthor Commented:
Just this one at the moment butI have had it with others, it seems to be secure websites that i have the problem with
davidrichardsonAuthor Commented:
Flushed the DNS again this morning and its working now

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