I get the following message and have been getting it for months. I just got it again using Warren's link
The following error occurred:
* 500 - Connection to remote site failed
when trying to access http://paul.aaquaria.com/Enter.html
This response is generated when the cache server could not successfully contact the remote server.
If this is the only site you cannot access, then it is almost certainly caused by the remote site being offline for some reason. Unfortunately there is little that can be done about this except to wait and try again later when the remote server admins have hopefully fixed whatever is wrong.