I have a Cisco ASA 5505 for my internet gateway.
I do not have VPN setup.
Several times a day, the ASA 5505 "goes down", and users cannot get on the internet. After a short while, the router begins working again, almost as though it did a "reset" or something. Is there some log or some way to see what is causing the router to stop like that? I found the "firewall" monitor in the ASDM, and it shows spikes in the "syn attack" graph, but I have checked the computers that show in the "under attack" list and those computers don't have a virus or malware (from what I can tell)
What I would like to do, is make sure all "VPN" related stuff is removed from the config if possible to ensure that I am not being attacked that way.