Fortinet FortiGate Dual WAN & ISP Failover Troubleshooting

Servicing24 provides assessment and scoped support in Bangladesh.

Internet access fails when one ISP drops, or traffic uses the wrong WAN? Servicing24 assesses the deployed dual-WAN design, SD-WAN or link-monitor configuration, gateways, routes, rule selection, NAT and DNS dependencies. Health checks are reviewed for suitable reachable targets, thresholds and recovery behavior.

Approved corrections are tested against the agreed failure and recovery scenarios. A physically active link can still have an upstream outage, so monitoring must reflect the intended failure conditions. Existing sessions may reset when public source addresses change. Inbound services and VPNs may need separate multi-ISP arrangements. Independent usable ISP links and appropriate connectivity are prerequisites; two WAN ports alone do not establish resilience.

Share the model, serial number, deployed firmware, topology, exact errors and affected traffic through an approved secure channel. Do not send passwords, VPN secrets or unmasked configuration backups in the enquiry. Changes require authorized access, customer approval, configuration backup and rollback planning. Disruptive changes and failover tests require an agreed maintenance window. Charges, scheduling, coverage and service warranty are confirmed in the quotation. Licenses, subscriptions, OEM contracts, hardware, ISP charges and wider network or application redesign are quoted separately. OEM escalation depends on valid entitlement and authorized account access. Firmware work requires a separately agreed compatibility and upgrade-path review. Resolution depends on the root cause; no fixed completion time or zero-downtime guarantee is implied.