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Exchange 2000 IIS authentication settings



Exchange 2000 IIS authentication settings Peter
4/21/2004 8:38:05 AM
iis security: Configuring Exchange 2000 OWA/Windows 2000 IIS i can do a lot of
configurations.
Regarding Authentication I can set the "Anonymous", "Basic" and "Integrated"
security option on both the "Default Web Site" and the "Exchange site".
Having exchange on the same server as the IIS and the DCs on other servers,
what of these settings needs to be set for highest security when accessing
OWA from the internet?

I have enabled the "Basic" and set the domain to the right domain name for
both Default web site and the exchange site but what about anonymous and
integrated? Does any of these need to be set so that things will work or?

I really need some input on this matter.

Thanks!

Re: Exchange 2000 IIS authentication settings Peter
4/21/2004 9:33:08 AM
Well, what of these check boxes does need to be checked (default website and
exchange) (Same or different on these two) to enable users to, wherever they
sit (internet cafés etc) to be able to use the web access to read/send
mails?

So the Anonymous isn´t requeried to be checked at all, anywhere?





[quoted text, click to view]

Re: Exchange 2000 IIS authentication settings Ken Schaefer
4/21/2004 4:51:45 PM
Hi,

a) Anonymous access won't work. The user needs to authenticate in order to
get to their mailbox :-)

b) Intergrated Windows Auth offers two auth mechanisms:
NTLM v2 (for older clients - pre IE v5. It is also supported by Moz
v1.4+)
Kerberos (which is supported by IE v5+)

NTLM v2 doesn't work through most proxy servers (because it requires
some backwards and forwards to auth the user, and it requires the connection
to be kept open)
Kerberos does not work through most firewalls, because the client needs
to contact the KDC (Domain Controllers in the Windows world) to get a
Kerberos ticket. And most firewalls don't allow clients on the untrusted
side access to the DCs on the other side.

So, IWA is not suitable for some internet facing scenarios.

Basic Auth is supported by all browsers (part of the HTTP/1.1 spec) *BUT*
username/password is not encrypted across the wire, so you need to use SSL
to secure the site.

An alternative to Basic Auth is Digest Authentication, which is supported by
IE v5+, Moz v1.0.1+, Opera v4+ etc. Digest Auth hashes the user password, so
it can't be stolen just be intercepting requests. Digest Auth does require
that user passwords be stored using Reversible Encryption on the DC. If you
have a Windows 2003 Domain, then you also have the option of Advanced Digest
Auth, but you seem to be using Ex2000, so I suspect you do not have Windows
2003 Domian.

Does this help at all?

Cheers
Ken


[quoted text, click to view]
: Configuring Exchange 2000 OWA/Windows 2000 IIS i can do a lot of
: configurations.
: Regarding Authentication I can set the "Anonymous", "Basic" and
"Integrated"
: security option on both the "Default Web Site" and the "Exchange site".
: Having exchange on the same server as the IIS and the DCs on other
servers,
: what of these settings needs to be set for highest security when accessing
: OWA from the internet?
:
: I have enabled the "Basic" and set the domain to the right domain name for
: both Default web site and the exchange site but what about anonymous and
: integrated? Does any of these need to be set so that things will work or?
:
: I really need some input on this matter.
:
: Thanks!
:
:

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