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⚠ Troubleshooting Hub

Real-world solutions to real-world problems. Browse vendor-specific troubleshooting guides, common error fixes, and step-by-step debug walkthroughs drawn from live support cases.

Vendor Coverage

Select a vendor area below to find relevant guides.

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Zscaler ZIA & ZPA

Cloud-native zero-trust security platform. Issues range from tunnel establishment failures to policy mis-matches and SSL inspection bypass problems.

  • GRE / IPSec tunnel not coming up
  • ZPA connector health and reachability
  • PAC file misconfiguration and bypass
  • SSL inspection certificate errors
  • User authentication & SAML SSO issues
  • ZDX score degradation and end-user experience
  • Bandwidth control and QoS policy debugging
  • Firewall policy allow/block rule ordering
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Palo Alto NGFW & Panorama

Next-Generation Firewall with App-ID/User-ID. Common issues include commit errors, security policy hits, Global Protect VPN faults and HA split-brain.

  • Global Protect gateway / portal connectivity
  • App-ID not matching expected application
  • Security policy shadow and ordering errors
  • NAT rule conflicts and misconfigurations
  • HA failover not triggering correctly
  • Panorama push commit failures
  • Certificate management and SSL/TLS decryption
  • Log forwarding to Syslog / SIEM
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Cisco IOS / NX-OS / ASA / FTD

From classic IOS routing to modern FTD, this section covers BGP, OSPF, ACL debugging, VPN tunnels and SD-WAN (Viptela) edge issues.

  • BGP neighbour stuck in Active/Idle state
  • OSPF adjacency not forming
  • ACL hit counts and traffic matching
  • ASA / FTD NAT and policy debugging
  • Catalyst spanning tree loops
  • HSRP/VRRP gateway failover
  • Cisco SD-WAN vEdge / cEdge control plane
  • QoS marking and queuing misconfigurations
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Fortinet FortiGate & FortiManager

FortiOS NGFW issues including IPSec VPN phase negotiations, SD-WAN SLA probe failures, HA config-sync problems and IPS sensor tuning.

  • IPSec VPN Phase 1 / Phase 2 failures
  • SSL-VPN client connection issues
  • SD-WAN performance SLA and failover
  • FortiManager policy package push errors
  • FSSO / LDAP authentication debugging
  • HA sync issues and failover delays
  • IPS signature false positives & tuning
  • FortiAnalyzer log collection and reporting

Troubleshooting Articles

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