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Customer gets a code drop 187 Octeon Decryption Message from a SonicWall to a Fortinet VPN Tunnel

03/26/2020 24 People found this article helpful 197,629 Views

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    Description

    Customer gets a code drop 187 Octeon Decryption Message from a SonicWall to a Fortinet VPN Tunnel

    Resolution


      Overview / Scenario:

      When configuring a Site-to-Site VPN tunnel with 5.9.0.6 between a SonicWall appliance (Site A) and a Fortinet Device on Site B) you get a drop code 187 on the Fortinet Site. For example if you use RDP through the vpn tunnel. Ping works but a RDP connection gives a drop code 187.


      Solution:

      Even if it is possible to use Address Objects in the IPSEC phase policy on FORTINET, do NOT use them

      Step 1: Start with a network group object with one or more Class-C subnet network objects and look if phase 1 and 2 finished without errors.
      If ICMP (ping) goes through the vpn tunnel.

      Step 2: Check if a Remote Desktop connection or telnet works. Here you run typically in the drop scenario when you try to access from FORTINET to SonicWall some resources.

      Step 3: Address Objects are "more compatible" in some cases on the Fortinet site to the SonicWall site at the other end, so do NOT to use address objects, but use network addresses instead on the Fortinet Site

      Typically this works without any change on the SonicWall site.


      Additional Information/Similar Problems which are SonicWall related:
      On the SonicWall Site there is a Hotfix available as well, for example if the problem appears between a SonicWall and a other SonicWall. The DTS Number is 130482 . The Hotfix can be requested via our Support Line.   

      Related Articles

      • Bandwidth usage and tracking in SonicWall
      • How to force an update of the Security Services Signatures from the Firewall GUI
      • Configure Guest VLAN in the TZ firewall, for guest users to access Internet only.

      Categories

      • Firewalls > TZ Series
      • Firewalls > SonicWall SuperMassive E10000 Series
      • Firewalls > SonicWall SuperMassive 9000 Series
      • Firewalls > SonicWall NSA Series

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