This is called a 'Captive Portal', not depending on password request or not. There are some ways to try to connect to, but mostly, they are not working. The main circumvention is, to log on with a 'simple' device, where the MAC-Adresse has been changed to the MAC Address of the Router. After log on, you might have access with the router... if it was only the MAC-Address, the Captive Portal is checking.
Others are playing around with the DNS-IP's. But overall, the RUT955 is not designed and programmed to solve this problem. This is my understanding ...