Can't log on to internet with firewall enabled. What's wrong?

Today, after Windows updates I can’t log to internet with firewall o.
The moment I turn it off, ionternet get’s available.
What should I do?

Is this avast or windows firewall?

What OS/SP ?
What exact version of avast ?
Any other security software installed ? (or was there)

Avast firewall…
I have internet security 2015 (10.2.2218).

I suggest an installation from scratch:

  1. Download the latest version of avast! Uninstall Utility and save it.
  2. Download the latest avast! version and save it.
  3. (Optional) If you want, save your avast! settings for later restoration (Settings > Maintenance > Back up).
  4. Uninstall avast! from Control Panel (if possible) and reboot.
  5. Run the avast! Uninstall Utility saved on 1 in and follow the instructions. Reboot Windows in Safe Mode, uninstall avast! and then reboot in Normal Mode again.
  6. Install avast! using the setup saved on 2. Register your free copy or add the license key for the paid versions. Boot.
  7. Check and post the results.

Please, be patient, boot when it’s said to boot…