All troubleshooting guides
Search 55 guides by issue, device problem, or topic.
FortiGate admin login page not loading
Check the management interface address, network reachability, and HTTPS management access allowed by your organization.
Read guide →FortiGate Firewall & FortiOSFortiGate administrator password recovery
Use approved device recovery procedures and verify ownership before attempting any recovery operation.
Read guide →FortiGate Firewall & FortiOSFortiGate firewall policy blocking traffic
Review source and destination interfaces, address objects, service definitions, policy order, and matching logs.
Read guide →FortiGate Firewall & FortiOSFortiGate internet access not working
Check WAN link status, default routes, DNS, and relevant firewall policies before changing configuration.
Read guide →FortiGate Firewall & FortiOSFortiGate DNS resolution problems
Compare DNS results from a trusted client and firewall and verify configured resolvers and routing.
Read guide →FortiGate Firewall & FortiOSFortiGate high CPU or memory usage
Review performance metrics, traffic patterns, and system logs to identify sustained resource pressure.
Read guide →FortiGate Firewall & FortiOSFortiGate firmware upgrade planning
Confirm hardware support, upgrade path, release notes, configuration backup, and maintenance window.
Read guide →FortiGate Firewall & FortiOSFortiGate firmware upgrade failed
Record the exact error and installed version, preserve backups, and follow version-specific recovery guidance.
Read guide →FortiGate Firewall & FortiOSFortiGate interface down or link flapping
Check cabling, negotiated speed, interface counters, and switch port logs.
Read guide →FortiGate Firewall & FortiOSFortiGate DHCP not assigning IP addresses
Check interface DHCP settings, available leases, VLAN tagging, and competing DHCP servers.
Read guide →FortiGate Firewall & FortiOSFortiGate NAT configuration troubleshooting
Review matching policy, source NAT mode, destination NAT, and upstream routing.
Read guide →FortiGate Firewall & FortiOSFortiGate web filter blocking a website
Inspect the matching policy and category logs, and request an authorized policy review.
Read guide →FortiGate Firewall & FortiOSFortiGate HA failover troubleshooting
Check heartbeat connectivity, cluster status, firmware compatibility, and monitored interfaces.
Read guide →FortiClient VPN & EndpointFortiClient VPN cannot connect
Confirm your assigned VPN gateway, connectivity, authentication method, and client compatibility.
Read guide →FortiClient VPN & EndpointFortiClient VPN stuck at 98 percent
Review the exact client and FortiOS versions, connectivity, and authentication logs before making changes.
Read guide →FortiClient VPN & EndpointFortiClient VPN disconnects frequently
Compare Wi-Fi and wired connectivity, network latency, client logs, and gateway session behavior.
Read guide →FortiClient VPN & EndpointFortiClient VPN authentication failed
Confirm the correct username format, MFA method, certificate status, and account authorization.
Read guide →FortiClient VPN & EndpointFortiClient VPN connection timeout
Test reachability to the approved gateway and confirm the configured VPN protocol and port.
Read guide →FortiClient VPN & EndpointFortiClient VPN connected but no internet
Check split-tunnel routing, DNS settings, and corporate traffic policies with the network administrator.
Read guide →FortiClient VPN & EndpointFortiClient VPN connected but cannot access internal resources
Check route installation, destination DNS resolution, user permissions, and firewall rules.
Read guide →FortiClient VPN & EndpointFortiClient VPN installation on Windows
Use the approved Fortinet download and confirm compatibility with your Windows version.
Read guide →FortiClient VPN & EndpointFortiClient VPN installation on macOS
Confirm macOS compatibility, required permissions, and the approved installation package.
Read guide →FortiClient VPN & EndpointFortiClient VPN update not working
Review the managed deployment policy, version compatibility, and installer logs.
Read guide →FortiClient VPN & EndpointFortiClient VPN certificate error
Verify certificate validity, trusted issuers, correct hostname, and device time.
Read guide →FortiClient VPN & EndpointFortiClient EMS registration problem
Check the managed endpoint assignment, EMS reachability, certificate trust, and enrollment logs.
Read guide →IPsec VPN & ConnectivityFortiGate IPsec VPN tunnel down
Review peer reachability, phase negotiation logs, shared parameters, and approved network changes.
Read guide →IPsec VPN & ConnectivityFortiGate IPsec phase one negotiation failed
Compare configured peers, authentication, proposals, and IKE versions on both ends.
Read guide →IPsec VPN & ConnectivityFortiGate IPsec phase two negotiation failed
Compare selectors, proposals, and relevant routes without exposing shared secrets.
Read guide →IPsec VPN & ConnectivityFortiGate site to site VPN no traffic
Check routing, policies, selectors, and counters on both tunnel endpoints.
Read guide →IPsec VPN & ConnectivityFortiGate VPN slow performance
Compare link latency, packet loss, encryption load, and tunnel MTU.
Read guide →IPsec VPN & ConnectivityFortiGate VPN DNS issues
Review DNS assignment, split DNS, client routes, and hostname resolution.
Read guide →IPsec VPN & ConnectivityFortiGate SD WAN failover not working
Inspect health checks, member status, service rules, and route selection.
Read guide →IPsec VPN & ConnectivityFortiGate routing loop troubleshooting
Review route tables, policy routes, dynamic routing neighbors, and recent changes.
Read guide →Fortinet Accounts & LicensingFortinet support portal login problems
Confirm the account email, use the portal recovery process, and check browser cookies.
Read guide →Fortinet Accounts & LicensingFortinet account password reset
Use the official account recovery workflow and protect reset links and MFA codes.
Read guide →Fortinet Accounts & LicensingFortinet device registration questions
Verify the serial number, authorized ownership, and registration eligibility.
Read guide →Fortinet Accounts & LicensingFortiGuard license not updating
Check device registration, subscription status, time synchronization, and service reachability.
Read guide →Fortinet Accounts & LicensingFortiGate subscription expired warning
Review the actual entitlement and renewal records before changing security services.
Read guide →Fortinet Accounts & LicensingFortinet firmware download questions
Identify the exact device model and firmware train and obtain images through authorized channels.
Read guide →Fortinet Accounts & LicensingFortinet support contract verification
Check the registered product and service entitlements through the approved support portal.
Read guide →FortiManager & FortiAnalyzerFortiManager cannot connect to FortiGate
Check management reachability, authorized device registration, certificate trust, and firmware compatibility.
Read guide →FortiManager & FortiAnalyzerFortiManager policy package install failed
Review the install preview, policy conflicts, device mapping, and installation logs.
Read guide →FortiManager & FortiAnalyzerFortiManager device out of sync
Compare running configuration with the managed database before authorizing reconciliation.
Read guide →FortiManager & FortiAnalyzerFortiAnalyzer logs not arriving
Check logging destination, connectivity, log settings, and storage status.
Read guide →FortiManager & FortiAnalyzerFortiAnalyzer report generation failed
Review report schedule, dataset requirements, available storage, and processing logs.
Read guide →FortiManager & FortiAnalyzerFortiAnalyzer disk space warning
Inspect retention settings and storage usage under the organization’s logging policy.
Read guide →FortiManager & FortiAnalyzerFortinet log search not returning results
Check the selected device, time range, log type, and indexing status.
Read guide →Security & General TroubleshootingFortiGate certificate warning in browser
Verify the management hostname, certificate chain, validity dates, and trusted issuer.
Read guide →Security & General TroubleshootingFortiGate SSL inspection certificate issues
Review authorized inspection policy, certificate deployment, and application compatibility.
Read guide →Security & General TroubleshootingFortinet two factor authentication not working
Check time synchronization, enrollment status, and approved recovery methods.
Read guide →Security & General TroubleshootingFortiToken activation problem
Confirm token assignment and enrollment through the organization’s identity administrator.
Read guide →Security & General TroubleshootingFortiGate blocked application troubleshooting
Review application control logs and the matching security policy before requesting changes.
Read guide →Security & General TroubleshootingFortiGate event logs missing
Check log destinations, filters, storage, and time settings.
Read guide →Security & General TroubleshootingFortinet configuration backup best practices
Use encrypted, access-controlled backups before firmware or policy changes.
Read guide →Security & General TroubleshootingFortiGate reboot or unexpected restart
Review system event logs, power stability, resource pressure, and firmware release notes.
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