Avast blocks Firefox traffic when HTTPS scanning is enabled

Avast Free Antivirus / Premium Security
1

Hello,

When I use Web SHield → HTTPS Scaning on Avast Premier and open anything in Firefox 63b9 I get an error: SEC_ERROR_UNKNOWN_ISSUER

HTTP Strict Transport Security: false
HTTP Public Key Pinning: false

This does not happen to Google Chrome however I prefer to use Firefox.

It happens since today (28.09.2018), and it did not happen before. Disabling HTTPS Scanning does the trick but shuts down a layer of protection as well. Any other solutions for this?

2

Repair Avast:

  1. Control Panel → Add/Remove programs → Avast
  2. Click on ‘Repair’.
  3. Follow instructions.
  4. Reboot.
3

It did work! Thanky You!

4

You’re welcome.