After updating ISP config, some of the website are going to default page. Emails are working fine. e.g. http://www.efficientexpress.com/
This seems to happen when some websites have * in the "IPv4-Address" setting and some have the IP-number written there. They must *all* be either the * or have the IP-number.
Open the site, it should be right there... Server: Client: IPv4: it should be either * or ip adress for all the sites. Not some * and some ip.