FortiGate fails to resolve FQDN after upg...

FortiGate

FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.

Article Id 335739

Description	The article describes how to resolve a known issue with FortiOS 7.6.0 where domain resolution fails.
Scope	FortiOS 7.6.0
Solution	After upgrading to 7.6.0, FortiGate fails to resolve the FQDN. The use of secondary dns-database zones can cause dnsproxy signal 31 crashes. The workaround is to change dns-database's zone to the Primary type. The issue will be resolved in release 7.6.1. Refer to this guide for the configuration: Basic DNS server configuration example \| FortiGate / FortiOS 7.6.0 \| Fortinet Document Library

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Troubleshooting Tip: FortiGate fails to resolve FQDN after upgrade to 7.6.0

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