Same problem and there is another thread with same issue as well:https://supportforums.cisco.com/message/3707716?referring_site=sds&channel=pkwidgets&id#3707716

Same issue here and Cisco has admitted to me there is a known bug related to port forwarding, although you will be hard pressed to find any documentation related to this bug. I am also a consultant who has recommended this product to a small business...