Pages not found after local multisite install.

Hi,
I've setting up a multisite install on my local machine for testing but am running into a strange error.

I have three sites set-up:

toronto.tim.localhost
vancouver.tim.localhost
montreal.tim.localhost

I am using existing sites for them and have set them up and installed the databases. Everything seems to be in check and I am able to load the home page for every site and they are displaying properly. Although no other pages will display, for every other page I get the error:
Not Found
The requested URL [URL] was not found on this server.

I've tried links on the homepage, as well as simply typing examples like: http://toronto.openfile/user and no pages are found.

Am I missing something?

Thanks
Tim