When visiting the "https" secure sites of vendor websites, forums, banks and online shopping retailers, you may see an onscreen warning, such as "There is a problem with the website's security certificate" or "Secure Connection Failed." Don't just click to continue or to make an exception. The warning may only indicate that there is a harmless misconfiguration with the site or with the network but it can also mean that the site is bogus or has been compromised by hackers. A compromised site means someone can be watching whatever you send or receive.
Be smart. Contact your vendor, forum, bank or retailer by phone to find out if they know about a problem with their website or the network. Don't be the next victim of fraud.