OWA, repeatedly asking user to enter username and password

I am having troubles with OWA from my network.

If I trying logging in from a basic Internet conenction, I can connect to OWA without issues, however when logging on from my company's network, I am prompted for a username and password repeatedly.

I am behind an ISA 2004 firewall, and have an exception for the address of the OWA server for HTTP (port 80).

Does anyone know if there is any special way to allow OWA access thru ISA 2004?
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Irwin SantosComputer Integration SpecialistCommented:
type in the following

username: yourdomainname\username
password: ******* (whatever that may be)
jonpontonAuthor Commented:
I have tried that, but the results have been the same.

I am able to log in without a worry from a standard connection to the Internet, but when on my network is when I have the trouble.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
OWA doesn't usually use port 80, it uses 443.

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jonpontonAuthor Commented:
The way in which this remote exchange server has been setup is to use port 80 - the address fro the server is http://mailserver.domain.com not https://mailserver.domain.com
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Overview of OWA security is here:  http://support.microsoft.com/kb/830827

OWA uses SSL.  Otherwise you need to configure OWA for Forms Based Authentication without SSL which is less secure:


1. Start Exchange System Manager, and then browse to the following location:
Server_name\Protocol\HTTP\Exchange Virtual server\Mailbox site
2. Right-click the Mailbox site, and then click Properties.
3. Click the Access tab, and then click Authentication.

To verify that the settings in Exchange System Manager are the same as the settings in the Internet Information Service (IIS) Administrator program:
1. Start the IIS Administrator program.
2. Right-click the Exchange Server site, click Properties, and then click Directory Security.
3. Click Enable anonymous access and edit the authentication methods.

For more info :



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Since Anonymous access allow everyone to access your server, you want to do instead is make sure Integrated authentication check. This will allow IIS to use network authentication when on a local LAN.
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