Hi Jim,
thanks for the quick response!. The URL for the story I initially tried is :
http://www.fanfiction.net/s/7623520/1/The_Good_Brother
so I tried a few more on fanfiction.net, and got the same error. Went to
www.whofic.com just to confirm with a generic (non-adult) story:
http://www.whofic.com/viewstory.php?sid=29654
and received the error again.
Lisa