TMOUT variable does not work on rbac and sftp.

Helo,

I've setup a TMOUT readonly variable on /etc/profile and it's working properly when users via ssh. The session is kicked afterr 1 hour of idle. But When I enter rbac I lost TMOUT variable. See below:

/etc/profile:
TMOUT=3600
readonly TMOUT

Loging via ssh and enter in rbac.
s03is@micro: /home/s03is # echo $TMOUT
3600
s03is@micro: /home/s03is # swrole admin
s03is's Password:
s03is@micro: /home/s03is # echo $TMOUT
0
s03is@micro: /home/s03is #

Or, I use eny client of sftp (windows or unix/linux) and TMOUT does not work.

Any hint?

Thanks.