could not open connection to the host, on port 80: connection failed

could not open connection to the host, on port 80: connection failed

"I have a problem HTTP port with my computer. I've installed Kaspersky with trail 30 days.
Recently kaspersky trail has expired. Then I tried to lunch Firefox browser. It said me ""No Connection"". Then I checked HTTP port (80) by telnet in command prompt. It said ""could not open connection to the host, on port 80: connection failed"""