SessionTimeout parameter in Siebel

Hi,

    Is there a maximal value to SessionTimeout parameter?

In our Siebel solution, we have modify our SessionTimeout parameter from 1 hour to 4.

When this was set to 1 hour, it works perfectly fine, but after having modify it to 4 hours, we realized it won't work anymore.

It's like we haven't set it at all...

ou default section on the IIS :

[defaults]

EncryptedPassword = True

AnonUserName  = GUE***T

AnonPassword  = ***************************

StatsPage     = _stat***c.swe

HTTPPort      = 80

HTTPSPort     = 443

EnableFQDN          = False

FQDN                =

;TrustToken          =

DoCompression       = true

GuestSessionTimeout = 300

SessionTimeout      = 14400

WebPublicRootDir = E:\sba80\SWEApp_GRC\public\fra

SiebEntSecToken = +pv**45646/*/*4/44GQ1Bj+

Thanks for your answers.

Jean-marc