Sophos Firewall Dual WAN & ISP Failover Troubleshooting

Servicing24 provides assessment and scoped support in Bangladesh.

Problems covered: Internet outages during ISP failure, incorrect WAN selection or unstable gateway switching.

Review WAN interfaces, gateways, health monitoring, SD-WAN routes, routing precedence, NAT and DNS dependencies. Assess upstream reachability beyond physical link status and the configured recovery behavior. Apply approved scoped corrections and test agreed failure and recovery scenarios during a maintenance window. Existing sessions can reset when the public source address changes. Inbound services and VPNs may require separate redundancy arrangements.

Validation and handover: Record the agreed checks, approved changes, remaining dependencies and recommendations. Monitoring covers only the agreed observation period.

Share the model, serial number, deployed software, topology, exact error and affected traffic through an approved secure channel. Do not send passwords, VPN secrets or unmasked configuration exports in the enquiry. Changes require authorized access, approval, a configuration backup and rollback planning. Disruptive work or 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 redesign are quoted separately. Renewal eligibility and OEM escalation depend on vendor rules and valid entitlements; support assistance does not imply OEM authorization. Firmware changes require separately agreed compatibility and upgrade-path review. No fixed completion time or zero-downtime guarantee is implied.