Web Services spawning sessions

Hi All,
I am facing a problem right now, exactly what is happening I am working in a project where we are using around 14 Web Services and they frequently interact with each other, Whenever this interation happens, a new Session is created, and if the con current users are more than say 40, there are many Live Sessions on the App Server, Now I want to know how to invalidate these Sessions, The Session Time Out setting is set to 60 minutes, thats the Business requirement. I can't lower it down. Kindly suggest from where else I can invalidate these Live Sessions as they are taking costly resources of the Server, and after 20-25 minutes the sites performance so too poor to work on.
Thanx in Advance

More details would help someoen narrow down this problem, what app server are you using? When you say they interact with each other, does this mean all the Web Service calls are intra-app server? What libraries are you using to run the WS interfaces and client calls?

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Neelima wrote:
>
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