sometimes I will try reconnect to my router, if it's a wireless connection click on your icon and disconnect and then try re connecting, sometimes it can be a problem with the router. Also have you deleted your cookie cache?
As you are using Chrome at the moment, log on and search using the error message and see what results appear, usually a list of problem fixes will appear.
Also if possible, check with your provider incase they know of any issues
Hope this is helpful