iCloud encountered an error while trying to connect to the server

Add an email account to Mail on your Mac

In the document above - try removing the iCloud Account and then Add it back

Further - sometimes the Apple Mail Service is having problems and is not working. Check the System Status website

User Wrote " MacKeeper real-time anti-virus software. " Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation

Are you running any VPN, Anti-Virus, or Cleaning apps?

Make a New Location, Using network locations in Mac OS X ...

System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.

System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.

The interface that connects to the Internet should be dragged to the top of the list.

Sys Prefs>Network>highlight the Interface you're using>Advanced>TCP/IP>Configure IPv4: Using DHCP.

If using Wifi, instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.

System Preferences>Network>choose interface>Advanced>Proxies Tab, make sure none are set, like for HTTP & HTTPS.

System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...

8.8.8.8

8.8.4.4

1.1.1.1

9.9.9.9

Apply.

The free Malwarebytes may take care of it...

https://www.malwarebytes.com/mac/

See if you have unknown Profiles.

To remove a configuration profile in macOS:

1. From the Apple menu, select System Preferences....
2. From the View menu in System Preferences, select Profiles.Note:
3. Profiles won't be visible until you have at least one profile installed.
4. Select the profile you want to remove, and then press the - (minus) button. Click Remove to remove the profile.

One assumes there is an Active and Functioning Internal Connection - Connect to the internet with your Mac

Can you log into www.icloud.com with Safari and using your Apple ID and Password and check if successful. If Yes, then the issue is your configuration with the Apple Mail and iCloud.

The removal of the existing iCloud account is covered the the previously link documents from Apple. Just Add it back once it is removed.

Have you tried P.Phillips' suggestion?

Can you log into www.icloud.com with Safari and using your Apple ID and Password and check if successful. If Yes, then the issue is your configuration with the Apple Mail and iCloud.

I have the same issue, but on a Windows 10 PC

"iCloud encountered an error while trying to connect to the server"

Happening on two PCs and three Apple devices (2 iPad 1 iPhone)

Tried adding iCloud back via Windows store. Got it to connect once. Disconnected and tried again and got the error.

I have rebooted, reinstalled no joy. Support shows no issues.

I have the same error message when trying to log on to my icloud email

"iCloud encountered an error while trying to connect to the server"

What is the fix to access my email? Thanks!

No.

The issue is on 2 windows 10 PC s, 1 iPhone 8, 2 iPads

Was able to connect a couple of times but when I tried again, I got the same error.

I don't think so.