Session timeout

[Chris Wahl]

Hi,all 

I am using TC4.0.6,
After I setting session timeout to -1 by adding following in 
web.xml:

  <session-config>
    <session-timeout>-1</session-timeout>
  </session-config>

In a servlet of the same web module I get such interesting output:

hs.getMaxInactiveInterval() = -60  // hs is HttpSession

My question is, why "-1" is replaced by "-60"?

Regards
Chris