'The page isn't redirecting properly'

Yestarday when trying to go on to one of my websites, i was shown this error:

"The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

* This problem can sometimes be caused by disabling or refusing to accept
cookies."

Now, it's happening with all my domain names. www.stevenfergus.co.uk,
www.strictcode.com and
www.sneakthru.net

www.stevenfegrus.co.uk is registed and 1and1 domains. The other two are registered at name cheap, so that tells me that it's not something to do with the domain names.

Has anyone got any ideas to why this is happening?

How are you making them redirect? What do you have on your .htaccess?

Well the usual way... i think. It's been working for a few weeks, just yestarday it stopped working.

I redirected it by changing the nameserver of the doman names.