Windows Phone vraagt vaak om je credentials voor syncen met Exchange

Het kan voorkomen dat een windows phone vaak prompt om je username/password om te syncen met Exchange, hieronder wordt uitgelegd wat het probleem is:

Open up Forefront TMG Management, Click on “Firewall Policy” in the tree in the left-hand pane and then find your OWA / Activesync rule.

Double-click on your OWA / Activesync Publishing Rule, then click on the Listener Tab, then the Properties Button for the Listener, then click on the Forms Tab, then the Advanced button on the Forms Tab and you will see a Check box call “Apply Session Timeout to Non-Browser Clients”.

Untick this check box, click on OK 3 times, Apply the rule changes and then the Password Prompt on your Windows Mobile phone should have stopped and syncing will resume normally.

As Activesync needs to keep a connection open with the Exchange server, with this setting selected, the connection is dropped and thus the phone thinks it needs to re-authenticate with the server. With the setting not selected, then phone is allowed to keep a connection open with the Exchange server and thus the password prompt doesn’t pop up.

Bron:
http://alanhardisty.wordpress.com/2010/11/05/forefront-threat-management-gateway-and-activesync-password-prompt-issues-on-windows-phones/