Firefox

Some issues with popup blockers and Excel services.

With the EWA, it’s harder to know when a session is no longer needed. It is hard (if not impossible with some popup blockers) to figure out when your browser closes down or when it navigates away from the page. That means that there’s a good chance that sessions that will be created from the EWA will actually linger for the full timeout period if we allow them. That said, one of the bigger scenarios for using the EWA is in dashboard scenarios where it is simply used to display information and does not need to actually do any operations. In those cases, there is no need for us to actually keep the session for a long time – we can get rid of it quickly – and since the user did not do any operations on it, they will not lose anything. For these two reasons, we have the short session timeout setting which will be assigned to all EWA sessions until the time when the user actually makes a request to the server, at which stage; the session will be assigned with the regular Session Timeout setting.

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Read more from this blogger: Short Session Timeout and Session Timeout in Excel Services - Part 1