Authentication type between Exchange 2010 and client

Arabsoft_Security
Arabsoft_Security used Ask the Experts™
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Dear All,

What is the authentication type are using between Exchange 2010 (NTLM or KERBEROS) and the client Outlook?

Thanks

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Commented:
This depends on your domain settings. What are you exactly looking for. Outlook starting from a client in a domain?

Author

Commented:
How I can check that?
Do I can check it from Exchange? or from AD?

Please let me know in details.

Thanks
Commented:
you can check security log files, for type of authintication you will find there if it is KERBEROS and teckit rental info
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Commented:
OK, how i can change it to NTLM or KERBEROS from AD?

Author

Commented:
There are two type of outlook connection:

MAPI (Internal) which used (by default) the Kerberos authentication.
Outlook anywhere (Outlook from outside) which used (by Default) the NTLM authentication.

Now; how i can change those settings?

I'm facing an issue which the client from internal can work only with NTLM?????
Commented:
check recieve and send connectors in exchange
Why do you want to change the default authentication methods ?

Just like arabsoft said, internal clients use MAPI connections and use kerberoes authentication.

When it comes to outlook anywhere, for external connections the connections are made the following: OA -> Autodiscover -> Exchange servers IIS (exchange server that holds CAS role) -> Cas querys exchange server that holds Mailbox Role and asks where the users mailbox resides <----- these auth methods are set on exchange servers IIS

Commented:
If your client is internal is it a domain member?

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