The WD My Cloud EX2 firmware update worked the first time I tried it a few days ago (updated to 2.10.310), but now, choose Settings > Firmware Update > Check For Updates and it says:
“Unable to connect to the firmware update server. Please check the network connection and try again.”
Settings > Network > Status indicates it has “internet access”, so it seems to see the internet ok.
At first it looked like doing a System Only Restore fixed this.
However, once I went through and turned off “public” on all the shares and made them all read/write from the admin account, it stopped working. Since I’m logged into the admin account you’d think it would amount to the same thing (except perhaps more secure), but apparently it’s not: When I turned “public” back on for the SmartWare share, it started working again. Problem solved.
Seems to me that enabling SSH and/or port forwarding required for remote backup causes the problem. Similar firmware update problem both on My Cloud and MyCloud EX2 Ultra. Both stuck on 2.30.196