Proxy Error at Login

For some time now, several months I think, I very frequently get the
following error when logging into RHN hosted for the first time on a
particular day.

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /rhn/YourRhn.do.

Reason: Error reading from remote server
--------------------------------------------------------------
Apache Server at rhn.redhat.com Port 443

I've looked around and haven't really seen anyone else reporting this
error so I thought I'd just take a chance here and see if others like
me just haven't been whining about it? Or accept that it is just me
and head over to support to figure out what is going on ...

John