Why am I losing sessions when running in StateServer mode?

Question

I have checked the servers (Win Server 2003) application event logs for the following problem http://support.microsoft.com/kb/308097 which doesn't show up. It just appears that sessions drop randomly for random users

It's a single server setup, no web farms and no load balancing

Even though the issue I point to above doesn't occur in the logs, is it worth increasing the stateNetworkTimeout attribute anyway? The configuration at the moment is simply

<sessionState mode="StateServer" cookieless="false" stateConnectionString="tcpip=localhost:42424" timeout="60"/>

UPDATES:

Using FormsAuth and the Timeout is set to 60

IIS6 Settings

1. Recycle worker processes (in minutes) = 120
2. Recycle worker processes (number of requests) = 35000
3. Recycle worker processes at the following times = Unchecked
4. Maximum virtual memory = Unchecked
5. Maximum used memory = Unchecked
6. Shutdown worker processes after being idle = 90
7. Limit the kernel request queue = 1500
8. Everthing else = Unchecked

Answer 1

Are you using Forms Auth? If so, what is it's timeout set to?

Answer 2

you also need to set the timeout in forms authentication section (30 min by default)

http://weblogs.asp.net/scottgu/archive/2005/11/08/430011.aspx