Netgear AV-line Switch "connection refused. Please try again later"

Hi there,

I've configurated my GSM4230P AV-Line Switch with the web browser. Worked fine as always. Also, gave it a new IP address. After that, changed the IP on my computer and logged in again via web browser. That worked as well with the new ip address. Now, two weeks later, I wanted to check the setting again, and suddenly I can't access the switch via web browser any more. Further, with the netgear engage app on my windows pc, I've tried to add the IP address manually. Then, an error message occures "connection refused. Please try again later".

Does anybody know what that means?

Thanks and best

Andrea