So, I've got two domains that both reside on the same server. If I use the RSS widget to import and display the feed of one on my other domain I always receive the following error message: "Error: could not find an RSS or ATOM feed at that URL". The feed url is correct and I am able to import everything from this address into my local MAMP installation of WordPress. I am also able to import feeds from other sources, on different servers, onto my online WordPress installation.
Thus, I believe some of the server settings are making it impossible for WP to access the feeds.
Does anyone have any specs on PHP / server settings for XML handling? Does anyone know how to solve this?