I found an ASP.NET site to change AD passwords online (http://unopasscore.codeplex.com/) and modified it for my environment. I tested it and it works fine at my local site, but it doesn't work at my remote site, and I'm not sure why. Both users that run the site have domain admin privileges, the site is identical in both environments, but it seems like there is something missing in the second environment because the error I get is:
" The password change operation failed with the following message: The specified directory service attribute or value does not exist."
Any ideas what I could be missing?