Your image is not an avast one that I'm aware of what 5.0 application are you running, avast free, avast Pro or avast Internet Security ?
If avast free or pro, have you made any changes to the default settings ?
What is your firewall ?
What other security software do you have installed ?
Rather than turn all shields off, try turning then off one at a time to see which is the cause. Start with the web shield, then the network shield, etc. checking after each one is turned off and report if you find the one involved.