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I received an error from the Security testing team as follows:

It was observed that same session value is used for different sessions. After logout, session value should be cleared and the user should be provided a new session value every time user logs in. It was observed that every time user login the session value was set to the following value "xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

How to rectify this? What would be the best approach to avoid these kind of issues?

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The cookie that SharePoint gives users has a timeout. What authentication method are you using? – Mike Nov 22 '11 at 15:22
Yes, normally it should timeout and probably the session value should be reset or changed I believe. The authentication method used is Windows. – Deepu Nair Nov 22 '11 at 15:28

ASP.NET does not always give a unique session ID. If no data is written to the session, ASP.NET may reuse the ID.

Here is an article explaining this:

I would advise working with the sec. team to try to get a replicable (simple) example of when this occurs to identify why the session Ids are being reused.

Check for trends such as web browser, time logged in etc.

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