www. help!

I need some help guys,

My one server is playing up, and I just can't figure out how to fix the problem.

Problem:

Sometimes, when typing for example - http://www.domain.com, it takes you to that website, yet at other times typing http://www.domain.com doesn't. Yet, when http://www.domain.com doesn't work, if you type in http://domain.com it works....

So, in other words the www. plays up badly, and I need it resolved as soon as possible.

I need a how-to on this, as it is beginning to be a right pain.

Any help, or links to a how-to to resolve this problem?

Thank you

 

 

 

 

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