Different applications may need different session timeout value.
For example, 60 seconds is usually enough for getting HTTP response from normal web sites. However some web servers need a longer time for requesting some data from other sites.
We can use telnet command "portmaptime?" to adjust the session timeout value.
portmaptime ?
Usage:
PortmapTimeSetting [- | ... ]
-t
-u
-i
-w
-s
-l : List your all setting
portmaptime -l
-------Your setting (seconds)------
-------TCP Time: 86400 ------
-------UDP Time: 180 ------
-------IGMP Time: 10 ------
-------TCP WWW Time: 60 ------
-------TCP SYN Time: 60 ------