Brand new Dell Optiplex 3080 with Norton 360 Deluxe, sharing files to 2 computers. File sharing works fine for a couple of days and then starts blocking most network traffic (e-mail, file sharing, and printing). Internet access is still good. Disabling the firewall in Norton will bring all functions back. Norton is logging "Rule: MS Windows network 2000 SMB" and blocking ports (port 445 for file sharing for example). I used Norton R&R to reinstall 360, and it worked for a couple of days again. Then the same problem returned. Same error messages. I have made sure the firewall has local network as either PRIVATE or FULL TRUST. I have made sure the rule mentioned above is still set to allow and enabled (Not reject). I have given one of the computers a static IP and included the IP and MAC address in Norton firewall with FULL TRUST. Still nothing unless I disable the firewall. Norton tech support said it was because I had a static IP on the computer. Then said change the static IP to another IP address. Didn't fix things and they gave up.
The problem starts when e-mail stops working in Outlook 2021, using IMAP e-mail from GoDaddy Workspace e-mail. Still trying to get them to move to a better e-mail host. GoDaddy has found no problems with the e-mail account and the other e-mail account never has a problem on Outlook 2016 on the other 2 computers (Same user). Same Norton 360 installation on all computers (Windows 10 - 20H1 or newer).
The computer that has problems is used heavily every day (About 90% of all computing use in the clients company) and has no other problems outside of the firewall. All functions work perfectly with the firewall disabled. Running things like SFC, DISM, CHKDSK have yielded no effects and find no problems or corruption.