servername v. IP as domain name

When I navigate to my page using the server IP address, everything
works perfectly. When I navigate to the page using servername,
everything works fine except for the Ajax calls. I get the error,
"This page is accessing information that is not under its control."
Apparently this is because servername and IP address are being
considered different domains. Does anyone know how I can set the
application up so that using servername will always work?

When I navigate to my page using the server IP address, everything
works perfectly. When I navigate to the page using servername,
everything works fine except for the Ajax calls. I get the error,
"This page is accessing information that is not under its control."
Apparently this is because servername and IP address are being
considered different domains. Does anyone know how I can set the
application up so that using servername will always work?

sounds like you're hitting the single origin policy. When you access
your page using a host name, are all the links, includes of javascript
files, ajax requests etc... using that name (and not the ip address) ?
Or to put things another way, don't mix names & ip addresses, you've
got to 100% one way.

Fred

I haven't mixed names and ip addresses. I am finding the error on
things such as form posts. I am using a form_remote_tag with :update.
When I use the ip in the url, everything is fine. When I use
servername, I can get to the page and form fine, but the :update isn't
firing. Rather, I get the specified error in IE, nothing in FF.