If you are trying to access you managed accounts in SharePoint Central administration site

And you receive this error:

It’s probably because you have created a new managed account with “Enable automatic password change”.  This issue should not happen if you have the latest SharePoint build number.

In order to fix the problem you need to use PowerShell to find the account that is set to “Automatic password change”

Get-SPManagedAccount | ? {$_.AutomaticChange -eq $true} | SELECT UserName

Once you have found the account, use PowerShell to remove the “Automatic password change” for the problem account.

$SPMA = Get-SPManagedAccount “<DOMAIN>\<UserName>”
$SPMA.AutomaticChange = $false

Then you will be able to access “Configure Managed account” in the SharePoint Central Administration site.