It seems that Check Point 1400 series SMB devices don’t handle Dead Peer Detection (DPD) that well when suddenly an external partner decides to enable it on a 3rd party firewall. Namely what happens is that you end up with tens of thousands of IKE SA’s on your little Check Point box and “Traffic Selector Unacceptable” errors in your logs.

Although in my case it didn’t cause any problems besides me being unable to see the output of the “VPN TU” command , since the IKE SA’s of the DPD flooded my console and the Embedded Gaia VPN TU utility decided not to show me it’s entire output and even crashed a few times. Ended up calling the other side and telling them to disable DPD. Hope they fix DPD support in some newer software release…