Blabababa  Master Member

Just upgrade directly at once if you don't have complex settings inside. Remember to backup your settings before doing so

Try reboot your nas, check the exact IP address it get from the router and reconnect.

Do you mean when connect vpn through mobile network to the ATP/USG, it works. However, it doesn't work if connect via home ISP line(PPPoE,IPoE, Cable modem, lease line…etc) ?? If so, can try to adjust the MTU size and see if packets were dropped due to packet oversized since you didn't see any log on ATP/USG which means it…

Found a faq looks can map to your case

Yes I think so

Hi @mat17 You may upgrade the firmware to the current release which should have fixed the symptom you saw. Here it is:

If your device is managed by nebula, you can pay from nebula portal directly, choose "License & inventory" Or you can buy it from zyxel's marketplace portal instead https://marketplace.zyxel.com/ I don't know what's the platform you shared but I think the official one is more reliable no doubt

Had you installed the UTM security pack or Gold security pack license on your device? As I know this is a licensed feature, I don't have it so I also see the popup notification just like yours.

Found a post talking about this. See if it can help. Failed to upgrade to the new ZLD5.21 patch 1: why and how to resolve it? — Zyxel Community

I have similar symptom on my device and Zyxel told me not to login to the device GUI after rebooting the device and they will release a patch for this issue soon. Try not to login to the device after rebooting and see if it helps

Just disable the DHCP service on the LAN, or you can even configure it as a router role if you want.

Could be server syncing delay, try sync again 

Found some hints from website: https://kb.zyxel.com/KB/searchArticle!viewDetail.action?articleOid=013675&lang=EN https://kb.zyxel.com/KB/searchArticle!viewDetail.action?articleOid=013225&lang=EN https://kb.zyxel.com/KB/searchArticle!viewDetail.action?articleOid=010046&lang=EN…

I don't think so, you'll need to add external zyxel ap (managed by USG20W-VPN) to support this

looks like the filesystem damaged for some reason, got power surge or power off device in accident ?, try restore your device.