What makes "localhost" stop working? How to fix?

What do I do to fix the fact that "localhost" suddenly goes no where?

I don't know exactly how this happened. I recall that I was able to pull up localhost in my browser and then one day I could not. it throws an error. The only thing I can think of is that I was prompted at work to reset my password. Does this mean I need to go into the IIS and reset my password there as well?

I have noticed other things going wrong suddenly as well. some intranet sites that I was able to access before, I am suddenly unable to bring up in a browser.

Please advise.

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Clarification Request
Is this Linux?

If so, you may have removed the local host entry in the hosts file in /etc folder.

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You almost explained it.

If your web server is not working or if you install a new firewall or AV suite it does fail. As the webmaster you need to check out your server.

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OK, well, the problem has been fixed.

OK, well, the problem has been fixed. But here is the strange part. I noticed that after I had done some work with the ISS settings and I found that there were still some issues, I began making further in-depth documentation to post, and, part of that process was to report on what I was seeing with some internal web site connections. Suddenly, those web site connections were working as they should be. It was if some network engineer at the company suddenly noticed he had to make some accommodations and he did it. So I am making this post here not in the spirit of completeness.

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