Changing Outlook Web App 2010 Timeout Values

This article explains the steps to change the OWA 2010 timeout values. When a user selects “public computer” in the OWA session, the timeout is 15 minutes by default and 8 hours if “private computer” is selected. He wanted to change the public timeout to be 8 hours as well. Though it is not recommended to have long timeouts for public sessions, below are the steps.

To make any changes to the OWA 2010 timeout (public or private), it is a registry edit on the CAS server. If you have more than one CAS, the change has to be made on all CAS servers.

Launch registry edit and navigate to the following location. HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesMSExchange OWA

Change the DWORD “PublicTimeout” / “PrivateTimeout” and put the required value in minutes. If the DWORD doesn’t exist, create them. My example shows the timeout value to be 480 (minutes), which is 8 hours.

OWA Timeout Values

Exchange Forms-Based Authentication service has to be restarted for the changes to take effect.

    • Hi Stephanie,

      The end user’s operating system should not matter in this case, if the change has been made on the Exchange servers.


  1. Hello, I would like to know to how to change server timeout connection in Outlook through group policy/registry. We use external mail server and outlook times out as the default setting is set to 1 minute. I want to change this setting domain wide and we have over 300 clients.

    So wondering if there any registry setting that can be used to solve this problem.


  2. Hello, we are using pop and smtp servers in outlook 2010 and would like to change the server connection timeout in outlook connection properties to 5 mins domain wide. Is it possible to do this through regedit or gpo? we dont use exchange server.

    Thanks in advance


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