Have you looked at your webserver's or WPMu's error logs for issues?
- Yes I have, but nothing there.
Can your server do call outs on port 80?
- yup
Did it work in the past?
- never
Is this a recent install or upgrade?
- fresh install
What version of WPMu are you running?
- 1.0.0. (I hope I'll find time to do upgrade. The only problem is, that I did some / many modifications and update will take some time
Are you using the object cache?
- no
Plugins?
- lots of them (do I need to post all of them)
Usualy I can find errors by my self, but this time I'm walking in dark, becouse I don't know how RSS feed (refreshing) is working in Wordpress.
Thanks for help!