Q: iTunes U could not update the content because iTunes U could not download the specified feed

trying to download a folder with 22 RSS feeds and keep getting the following message:

iTunes U could not update the content because iTunes U could not download the specified feed.

however when I type in the actual URL feed into any browser I can see the RSS feed.

The RSS feed Server is up and running and I am able to download smaller folder with say 3 RSS feeds from this server, but when it comes to a bigger size Sitemanager just throws the error below:

iTunes U could not update the content because iTunes U could not download the specified feed.

So is there a hard limit to what Sitemanager can download from the RSS feed server?

Thanks,