I cannot file my e-return because it says my connection is not secure. I have updated antivirus and firewall software (Mcafee) and my connection is secure. now what?

If you are running antivirus and firewall software you can check out these steps to see if anything helps: https://ttlc.intuit.com/replies/3302049

If you are using a Desktop product, you can also try these troubleshooting steps: https://ttlc.intuit.com/replies/5454023