Authentication error trying to log Mesh 6 MK63S-100NAS system to connect to ISP router

[NewTexan]

Getting an authentication error when trying to log the unit onto my ISP modem. Using same password as for any other device. Have used cables for both ports, ethernet and internet on main unit. Mesh main unit only has ethernet port.

MK63S-100AS

[plemans]

whats your isp device?

If it has its own integrated router it causes a double nat. 

A double nat happens when you cascade more than 1 router.
https://kb.netgear.com/30186/What-is-Double-NAT
Fixes? There’s 3 options but only use 1.
1. Put the modem/gateway in modem only/pass through mode. This disables its routing functions.
2. Leave the modem/gateway in router mode but put the Netgears IP address into its DMZ. This forwards the data to the netgear. You can either leave the modem/gateway’s wireless enabled or disabled. Just make sure its using a different wifi channel to prevent interference
3. Put the Netgear into access point mode. This disables its routing functions. Wifi/ethernet still works but it does disable some features.
https://kb.netgear.com/26765/Which-features-are-disabled-on-my-NETGEAR-router-when-it-is-set-to-AP-M...