In addition to the other helpful responses, a couple of things to try:
1 - assuming you are on a windows 11 pc - go to settings, network and internet, advanced network settings, hardware and connection properties. Have a look for ipv4 default gateway, and see what the ip address is. The DNS server is the same as well if you haven't changed it to something else. I'm using a separate router so can't check, but the ip address there is typically your hub if you are using that as router as well as modem, and is what you are after.
2 - the old turn the hub off and turn it back on.
Getting a "not secure" message sounds like a security issue somehow. Have you a different browser to try just in case it is a setting or cache in your main browser?