I have created an iTunes RSS feed for my video podcast:
http://designmind.info/feeds/itunes.xml

For the first few weeks, it worked fine. But lately, iTunes has started giving this error message:

iTunes can’t verify the identity of the server “www.designmind.info”.
The certificate for this server is invalid. You might be connecting to a server that is pretending to be “www.designmind.info”, which could put your confidential information at risk. Would you like to connect to the server anyway?

How can I fix this. It is not SSL hosting, so I am not sure why it needs a certificate.