We're having some issues with getting the "Reply" function to work for comments in our WordPress site. Submitting comments in general works fine, but even though the URL I'm redirected to from the "Reply" button looks correct, it just posts it as a normal comment, and the title above the comment section is just the regular title, not the expected "Leave a Reply to...". It's a custom theme, but it's set up to support this and WordPress itself is configured to allow threaded comments down to the default 5 levels.
Here's the site in question: http//antagonist.no
What's strange about this is that it only happens in the live environment. I have a testing environment set up locally, where WordPress is configured with the exact same configuration and version of our template. The Reply function works perfectly there, with the same URL structure and parameters, and I'm unable to reproduce what's going on in the live environment.
The only differences are the hosting environments: my local testing environment runs on Apache 2.2 on OS X 10.9, while the live environment runs on IIS 6 on Windows Server 2008 R2. Both are running PHP 5.5.8. Could this be due to the URL rewriting for permalinks? WordPress does this automatically on Apache, but on IIS in the live environment we used a plugin called ISAPI_Rewrite 3 (http://www.helicontech.com/isapi_rewrite/) to support the URL rewriting, with the following rules:
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?p=$1 [NC,L]
It seems to work fine for anything else than comment replies.
Any ideas for things we could check for or try?
