Connection Error: iCloud encountered an error while trying to connect to the server.

BooneKate Said:

"Connection Error: iCloud encountered an error while trying to connect to the server."

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Troubleshooting iCloud Logins:

A. Go here: If you can't Connect or Sign in to iCloud - Apple Support

B. Try Safe Mode:

In Safe Mode, login items do not run, and corrupt system files(i.e. caches) are intentionally reset as a way to fix issues

1. Boot: in to Safe Mode: [Hold Down: shift key upon boot].
2. Log in: as same user
3. Wait: 30 seconds
4. Restart; your Mac
5. Log in: as same user
6. Perform another login

C. Restart your Router:

Poor off your router for 30 seconds, and then power it back on. Try this once more.

D. Disable VPNs:

Are you connected to a VPN? If so, disconnect form it while logging in.

E. Try Later On:

There is likely an error connecting to Apple's servers. So, try this tomorrow, or later in the day. Utility work may be taking place down the street.

I was having this issue on a Windows PC. This video's solution is the only thing that worked for me. In case the video doesn't work for you:

1. Type ncpa.cpl into your Windows search bar. Click on the resulting "Control panel item" which should bring you to this screen:
2. Whatever your active network adapter is (wireless card, ethernet adapter), right click it, click Properties, then uncheck IPv6 setting, like below. Note: if you're plugged into ethernet and your wireless card is connected, you want to change this setting on whichever connection is active. Typically the ethernet will be active if both ethernet and wireless card are connected.
3. Try icloud.com again.

I'm not a tech expert, but this seems to suggest Apple has a configuration issue they need to change.

BooneKate Said:

"BooneKate here again, and the Safe Mode protocol is not working.[...]"

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If you can't Get In, Contact Apple Support:

Contact Apple Support:

As you might suspect, no one here would know the reason for this occurrence, of course. So, contact Apple Support. They’ll know why this occurred and will run you right through the fix.

Apple Support Contact Us Info:

• Contact Us - Choose Locations
• Proceed from there as necessary
• Note: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

Hi, turning off IPV6 works, but it is embarrassing for Apple to develop an interface that does not work with this protocol.

BooneKate Said:

"Connection Error: iCloud encountered an error while trying to connect to the server. […]I tried safe mode and it worked! Thank you!!!!!”

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You are welcome. Excellent job troubleshooting!

See this thread My mac won't let me sign in to my icloud … - Apple Community

Ok thanks I will retry tomorrow with Cellular Enternet Sim card

Thanks

That worked thanks

Yeah, worked for me. Interface looks very different in Win11, but close enough that I could sort it out. Thanks!