@Bart_wu Hi, welcome to the community. Which VPN did you find blocked by the Deco? By the way, what is the current firmware version of the Deco M4? Wait for your reply and best regards.

@OceanMall Hi, welcome to the community. It is suggested to check the IPV4 address on the Deco APP>More>Internet. Double NAT In order to open the ports, you might need to have a public IP address...

@TulioLuisFR Hi, would there be any error message on the S21 Ultra when the Bank APP failed to load? It is recommended to set the IPv4 DNS to 8.8.8.8/8.8.4.4 to see whether it helped: How to change...

@pbertens Hi, welcome to the community. Is the current network topology like: ISP modem--- main Deco X60---<cable>---network switch----satellite Deco X60#1+other wired devices...

@Blufkip Hi, welcome to the community. It is recommended to install the beta firmware here to see whether it helps: Satellite Deco Units Work Well but Display Offline on the Deco APP Best regards.

@Benji31470 Hi, Thank you very much for your feedback. Have you tried to factory reset the Deco once(hold the reset pinhole for 1s) and set it up again on the Deco APP? It seems like the Deco app...