Administration
Navigate to System > Settings > Administration
Web UI
- Check
HTTP Strict Transport Security - Uncheck
Disable web GUI redirect rule(Firewall will only serve HTTPS now) - HTTP Compression:
High(If you have a low power device, leave it off) - TCP Port: Recommended to change it

SSH
- Keep
Secure Shelldisabled, unless you are gonna use it. - Uncheck
Permit root user login, Recommended to use SSH Keys. - SSH Port: Recommended to change it

Click Save