Dell Inspiron 5537 shows limited access although Internet is connected.

I have a dell Inspiron 5537 laptop. It works all fine. From the past 2 days it has been showing a small yellow icon over the internet sign and says that I have limited access although my internet is working fine. What can I do to remove this sign? Is this a problem with my laptop WiFi antenna? Or is it something to do with my hardware driver? Please guide.
