Outlook connection issues to Exchange 2010

 In MS Exchange 2010

I’m guessing this goes for Exchange 2007 also

When you start Outlook and try to open your mailbox, which is on the server, the attempt fails.

This is due to the default encryption behaviour of Exchange 2010 – All client server connections are set to require encryption.

So, one of two things can be done

To manually update an existing Outlook 2003/7 profile so that it uses RPC encryption with Exchange 2010, follow these steps:

  • In Control Panel, open the Mail item.
  • Click Show Profiles
  • Select your profile, and then click Properties.
  • Click E-mail Accounts.
  • Select View or change existing e-mail accounts, and then click Next.
  • Select the Microsoft Exchange Server account, and then click Change.
  • In the dialog box that contains your mailbox server and user name, click More Settings.
  • In the Microsoft Exchange Server dialog box, click the Security tab.
  • Click to select the Encrypt data between Microsoft Office Outlook and Microsoft Exchange Server check box, and then click OK.

Then open Outlook – I found it took slightly longer to make the connection AND to use Outlook.


Disable the requirement on the Exchange server, for encryption

Open the Exchange management shell, on the exchange server and type

Set-RpcClientAccess –Server Exchange_server_name –EncryptionRequired $False

If you want to enable it again at a later date

Set-RpcClientAccess –Server Exchange_server_name –EncryptionRequired $True

Microsoft do warn you that you should keep encryption enabled. I guess it depends on your mail environment.


SOURCE = http://support.microsoft.com/kb/2006508

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