Extended flows being torn down?

Hello.
I have a SAN with an external client. The inbound backup flow goes through an 11506 with ver 7.2~. Backups of 2 to 3 hours work fine, but others with a longer time die around 8 - 10 hours into the session.
I modified the flow-timeout multiplier for 20 hours, but that didn't help- as I expected. The session is dying mid-activity and not during an idle period. Has anyone encountered similiar behavior in long term flows?
As a separate question - how is the flow-timeout value calculated? Isn't the default 16 (16*16=256)? It would seem then that if I opened a terminal window into a backend server and let it sit - I should see it terminate within 5 minutes. But usually, the window will stay active until an overnight period..then close. Modifying the flow-timeout value fixes this problem, but doesn't quite explain why the default value didn't time out the session sooner.
Thanks,
Chad

Gilles,
There is no RESET.
On the content rule, I set the flow-timeout.
And yes, the content is hitting the right rule.
I understand the CSS doesn't "proxy" the connection, but does session information (layer 5, OSI) get exchanged between the client and CSS in place of the server?
For example, I had a Solaris 2.6 client that FTP'd large files (2GB) to a server without issue. When I placed the server behind the CSS, the ftp would fail on these large files..around 1.65GB. If I put the same file on another client - say a Linux box - the ftp succeeds to the same server. This leads me to believe that something isn't being agreed on correctly in the session or presentation portions - but how do I confirm that?
So previous experiences like this, add further confusion to my current problem, where small volumes from the client to the SAN succeed, but a larger,longer-term volume backup fails after 8-10 hours.
If the CSS resources were being maxed, would it kill off active long-term flows? I have no indication that the CSS is maxed on resources, but at this point I'm trying to consider all options.
Thanks,
Chad

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