How to Invite a User with Onboarding Portal How to configure IIS Restricted Access for OWAĬonnect first SaaS application - Office365 Troubleshooting - FortiGate Cloud Management issue So I went back to the GUI mode of both Firewalls in two sites and made sure the Phase -1 Settings are same on both ends.Acreto SASE+ Remote User Access Use Case Checklist and Deployment GuideĪcreto Connect Client - administrator guideĬonnect the Thing with Acreto Connect ClientĪWS Site-to-Site VPN using Virtual Private Gatewayįortinet FortiGate IPsec Configuration through CLI I have repeated the above debug commands in FortiGate Cli at Data Centre Site and in each iteration I have identified the error mgs - " Encryption, Auth Algorithm ,IKE Version Mismatch ,Security Association Negotiation Failure "from the debug output. I have used the above command in the the FortiGate CLI at Data Centre site and from the debug output I have observed that there is a Preshared Key Mismatch from logs.ĭue to mismatch in the preshared key IPsec peers are not able to authenticate each and other hence the security association is not negotiated. Proxyid=To_Site_A proto=0 sa=0 ref=2 serial=3ĭebug Command -2 : "diagnose vpn ike log filter name "ĭebug Command -3 : "diagnose debug app ike -1"
SA bit need to be 1 for successful SA establishment.
įrom the debug msg I have observed that Security Association bit "SA -0 " indicates there is mismatch between phase -1 selectors in IPsec peers or no traffic is being initiated. Please refer the debug output screenshot that I have attached. Instead of verifying the phase -1 settings in GUI I used CLI and debug commands/ messages to identify the problems. Note: Logs & reports feature in Fortinet GUI will give the debug msg report as well.ĭebug Command -1 : " diagnose vpn tunnel list name " To view the phase-1 or 2status for a specific tunnel. I have used the above command in the the FortiGate CLI at Data Centre site. So I decided to verify these configurations in my topology. So the Phase -1 IKE version, Pre-Shared Key, Authentication Algorithm, Encryption algorithm, Diffie Hellman group need to be configured as same in IPsec Peers.
In the IP Sec IKE Phase-1, we understood that Security Associations are exchanged and negotiated, and authenticated between IPsec Peers. IKE Version Mismatch ,Security Association Negotiation Failure ) Step-3:( Phase-1 Troubleshooting, Pre-shared Key, Encryption, Auth Algorithm. Important point to be noted here is SPI field which points to the respective Encryption and Authentication Algorithms. In tunnel mode, New IP header is added to provide extra layer of protection by defining Security policy to the inner IP packet.įollowing diagrams are self explanatory regarding the IPsec process that happens in Phase-1 & Phase-2.Different fields in AH Header and ESP header are depicted. In transport mode, the IP addresses in the outer header are used to determine the IPsec policy that will be applied to the packet. It operates in Transport and Tunnel Mode. A VPN "tunnel" is the encrypted connection a VPN establishes so that traffic on the virtual network can be sent securely across the Internet. IPsec provides data integrity, basic authentication and encryption services to protect modification of data and unauthorized viewing by using Authentication Header (AH), Encapsulating Security Payload (ESP) and Internet Key Exchange (IKE) protocols.I have prepared the following diagrams which is specific to Lab topology. Before going into the Lab topology I would like brief about the IPsec VPN Tunnel formation and the type of messages exchanged in IKE Phase -1 and IKE Phase-2.