cookie question?

I have a network set up at I have a website I'm working on, on the network, that uses a custom domain

The website displays just fine using the custom domain, except that I cannot login to the domain's wp-admin area because the script doesn't set a cookie.

So far I've checked these...

All cookie settings on my computer are set correctly. points to the dedicated IP address of my network

In my network setup user tony has one site and it's set to

.... am I missing something?

If you want you can go to and try to login. I'll be glad to send the username and password if you want them.

For me it doesn't set a cookie. I doubt that it will for you either.

Can you please make suggestions or refer me to documentation that might help me resolve the issue?