Hi,  @MaartenMechanic 
Thank you for posting on our business forum. 

Please try the following troubleshooting stpes:

1. Please verify whether local access to your ER7212PC works normally, and confirm that the device is operating stably.
2. Please kindly ensure that your ER7212PC maintains stable network connectivity. If you access ER7212PC via the cloud platform, please note that the device must be connected to the cloud server to enable normal access.
3. When you are unable to access ER7212PC via the cloud platform, could you please check whether the device's Cloud indicator light is illuminated properly?

  @Nathan-TP Thank you Nathan, I will give your suggestions a try. 

Step 1 i guess we can tick off the list, because I CAN connect to the VPN server and then make the local (LAN) connection. This is afterall what the VPN connection is party for, make a local connection, but just to confirm: I have made this connection and succesfully logged in to the controller when I could not through the Omada cloud. 

Step 2. So, this is the question. Why does it most of the time NOT connect to the cloud? 

Step 3 Good thing to check. Will try to find out. Perhaps this will tell us more. 
 

You are welcome. If you make any progress, please feel free to share it with us.  @MaartenMechanic 

  @Nathan-TP 

After trying to connect to the controller again through the Omada Cloud platform, again I received an error message: "Failed to Connect"

Then I tried the VPN and locally I was able to logon to the controller. There I checked the cloud connection of the controller: 

So, here the controller indicates there is a cloud connection. 

Hi,@MaartenMechanic 
Thank you very much for your reply. Could you please follow the troubleshooting steps below:

1.When you are unable to access the cloud platform, please connect to your ER7212PC via VPN. Then navigate to either Site View or Global View, locate Network Tool > Network Check, and run a ping test to 8.8.8.8 to verify if the address is reachable.


2.Please navigate to Site View > Logs > Settings > Content Settings, select the Device option, then enable the "WAN is Down" logging function. After completing the settings, please check whether any "WAN down" record appears in your logs when the cloud platform becomes unreachable.

Hi,@MaartenMechanic 
Great to hear that your issue has been successfully resolved.

Generally speaking, the time zone configuration of the controller will not cause unstable connection to the Omada Cloud. However, since your issue was fixed after adjusting the time zone, the possible cause can be explained as follows: With different time zone settings, your controller will connect to the Omada Cloud node matching the configured time zone to complete time verification. Incorrect system time can easily lead to packet loss, and we also cannot rule out the possibility that your original connection abnormality was affected by replay attacks.