IP filtered website & RSS feeds (using Autoblog)

I have a little Wordpress multisite that can only be accessed from certain IP's/locations so I have an IP whitelist in my htaccess file.
Sadly as a result of IP filtering, all my RSS from these sites give errors & I'm unable to display feeds within / to and from each multisite. I actually use Autoblog to duplicate articles between each site.

"A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed."

When I copy and paste one of these feeds(addresses) into my browser, I can view them however so I gather there must be a way to bypass Simplepie so that these feeds can be viewed within my sites even though they are IP filtered.

Thanks for any help!