RSS feeds for ww.wp.xz.cn not working

Have you tried:

– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the default theme to rule out any theme-specific problems?

– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress?

– increasing the available memory?
http://ww.wp.xz.cn/extend/plugins/memory-bump/
http://ww.wp.xz.cn/support/topic/253495#post-1017842

– reviewing http://ww.wp.xz.cn/support/topic/411649

I’ve got a brand new install of WPMU on a server here with no plugins or any data to speak of. When I go to the dashboard I’m getting the same errors. I can’t add rss feeds in the sidebar widget either. nslookup, ping, and dig all work fine from that server. Additionally, when I went to install the buddypress plugin by searching for it in the plugin installer in the wp-admin area I got this error: “An Unexpected HTTP Error occurred during the API request.” The section called “Popular tags” on that page (wp-admin/plugin-install.php) was also empty.

done: http://ww.wp.xz.cn/support/topic/423352?replies=1#post-1596730

No. You’re using MU. The original poster was using WP 3.0 – presumably without multisite enabled.