Too many redirects after move

Hi,

Just moved a bunch of sites from a dedicated HostGator running an old version of CentOS (5.1 I believe) as well as older versions of php, MySQL, etc... to a new server at Linode running Ubuntu 14.04LTS and webmin/virtual min.

While the site loads fine, and is usable, I'm suddenly seeing one page ... which downloads some results collected on forms ... give me a "Can't load page" error because of "Too many redirects".

Note: All software is updated.
The code base hasn't changed in many years and is an off the shelf product. Permissions have been "fixed" via virtualmin. Virtualmin has validated the entire server.

Any thoughts on what this might be? And, if it's an issue of CentOS vs. Ubuntu, or old versions of php or something, any ideas what I might look for?

Thanks!

Neil