Penny  Ally Member

What is the model of the printer? And did you do any modify before the printer got offline? Seems it could work at first.

So it does not always happen? what is the frequency?

Try to factory-reset to clear all settings. And re-configure the setting you want.

Did you use Basic Dropbox account? or upgraded recently? As I know, Plus / Professional accounts are not supported by NAS542.

Do you have a screenshot? Maybe those ports are already occupied on your router?

Agree with @Mijzelf Reset button should be the salvation.

You need to use FTP client to connect your NAS326 to upload/download files. FTP client such as FileZilla Client. (https://filezilla-project.org/download.php?platform=osx)

Is there any screenshots or message about error (code 100057)? Maybe you can try to use FTP service to download your photo from NAS326 to your PC.

Checked on ZYXEL Global Website: NAS540's HW Specification. https://www.zyxel.com/products_services/4-Bay-Personal-Cloud-Storage-NAS540/specifications

Which firmware version you upgraded? Do you have set some special characters in password of user's account? You can refer to below link. https://homeforum.zyxel.com/discussion/3370/faq-upgrading-latest-nas-remote-code-execution-vulnerability-firmware#latest

Is there any message pop-up after click "Retrieve List From Internet"? How about other packages? Can you able to install others?

In addition to HomePlug LED no light, do you encountered other problem? About HomePlug LED off, it means your PLA4201 does not connect to other powerline device. Do you have only one PLA4201 or more than one?

May I know how do you check this? From NBG6817's DHCP table? Is possible to simply drew your network topology? I checked some setup guide, its default IP is 192.168.1.20, am I right? If yes, do you able to access it when control computer and Loco M2 are connected the same LAN network? (Such as NBG6817 --- Loco M2 and…

Has any screenshots to help to clarify the problem? So far, the only problem is that you cannot see Nano devices shows on DHCP table of NBG6817? Does Nano devices connect to NBG6817 via Ethernet cable or ...? Currently, from your description, I think the problem is related the installation of your Nano devices, please make…

Is there any issue you encountered?