We would like to bring to your attention that Dropbox has recently updated its security protocol for establishing connections.
Unfortunately, this change has broken compatibility with the WISE-40XX series, rendering these devices unable to communicate with Dropbox.
As a result, we recommend that the customer consider one of the following alternatives for backup purposes:
1. Use other cloud storage – such as a Private Server.
2. Upgrade to WISE-4250 – This model supports the latest security protocol and remains fully compatible with Dropbox.
https://www.advantech.com/zh-tw/products/wi-fi-24ghz-5ghz-wireless-i-o-module/sub_229f9f5b-d073-4cc2-ac54-d90147e04c12
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