I am having an intermittent issue when using a gateway to gateway VPN tunnel between RV042's. Randomly I will loose connectivity through one of my tunnels. When I check the status of the endpoints in the web interface they both say 'Connected'. Pressing the disconnect button and renegotiating the tunnel restores connectivity. Also, waiting until the Phase2 SA Lifetime expires and Phase 2 re-negotiates also restores connectivity (hence the title of the post). I have one unit at the office which tunnels to several remote units. They are all running the 188.8.131.52 firmware. It seems to happen on some tunnels more than others but they have all exhibited this behavior to some degree. I have used this setup for a few years now but it seems to be getting worse lately. There seems to be nothing useful or even unusual about the VPN logs. The settings for the tunnels are as follows: Keying Mode: IKE with Preshared Key Phase1 DH Group: Group 1 Phase1 Encryption: AES-128 Phase1 Authentication: MD5 Phase1 SA Life Time: 28800 seconds Perfect Forward Secrecy: Yes Phase2 DH Group: Group 1 Phase2 Encryption: AES-128 Phase2 Authentication: MD5 Phase2 SA Life Time: 3600 seconds Aggressive Mode: No Compress (Support IP Payload Compression Protocol(IPComp)): No Keep-Alive: Yes AH Hash Algorithm: No NetBIOS broadcast: No NAT Traversal: No Dead Peer Detection (DPD): Yes 60 seconds I have tried with DPD disabled and shorter intervals and they do not prevent the problem.