F5 LTM - Unable to download 5MB file

i'd use tcpdump to sniff the conversation between client and virtual server/server to bigip to note if there's an HTTP error code or a connection reset or something else.

If there'd have something wrong on f5 configuration that doesn't let you pass a 5MB file, i think it should be recorded on /var/log/ltm o messages, have you had a glance at those logs?

regards, hheredia (sorry for the english :D)