Published coverage by product
Know your system.
Browse products that already have a published diagnosis. Every linked page states its symptom, applicability, evidence, and version notes.
Cloudflare
Cloudflare Tunnel
Cloudflare Tunnel Is Connected but the Public Hostname Returns 502: Unable to Reach Origin Service →
Docker
Docker Engine
Docker Container DNS Not Working: Separate IP Path from Name Resolution →
Docker Container Has No Internet: Diagnose the Outbound Bridge Path →
Docker Published Port Works Locally but Is Unreachable from the LAN →
Eclipse Mosquitto
Eclipse Mosquitto
ESPHome project
ESPHome
ESPHome Device Is Online but Unavailable in Home Assistant →
Frigate project
Frigate
Open Home Foundation
Home Assistant
Home Assistant Matter Device Is Unavailable After Pairing →
Home Assistant Cannot Add a Matter over Thread Device →
Home Assistant Blocks Requests from a Reverse Proxy Until It Is Trusted →
Home Assistant Thread Border Router Not Found: Check Discovery, Credentials and the OTBR App →
Immich project
Immich
Immich Upload Fails Through Cloudflare Tunnel While a Trusted Non-Tunnel Path Works →
Jellyfin project
Jellyfin
Network UPS Tools project
Network UPS Tools
Nextcloud GmbH
Nextcloud
Nginx Proxy Manager project
Nginx Proxy Manager
Nginx Proxy Manager 502 Bad Gateway: Diagnose the Upstream →
Nginx Proxy Manager Let’s Encrypt Certificate Renewal Fails →
Deciso B.V.
OPNsense
OPNsense VLAN Client Gets an IP Address but Has No Internet →
Pi-hole
Pi-hole
Portainer.io
Portainer
Proxmox Server Solutions
Proxmox VE
Proxmox LXC Container Has No Internet: Diagnose Bridge, Gateway and Firewall →
Proxmox VE Host Has No Network After an 8-to-9 Upgrade →
Proxmox VM Reaches Its Gateway but Cannot Reach the Internet →
restic project
restic
Syncthing project
Syncthing
Synology
Synology DSM
Synology Hyper Backup Insufficient Destination Quota →
Synology Hyper Backup Restore Only After an Integrity Check →
Synology Hyper Backup Destination Offline over Tailscale →
Synology Hyper Backup Taking Longer Than Expected →
Synology Hyper Backup Task Suspended After Interruption →
Synology
Synology Hyper Backup
Synology Hyper Backup Insufficient Destination Quota →
Synology Hyper Backup Restore Only After an Integrity Check →
Synology Hyper Backup Destination Offline over Tailscale →
Tailscale
Tailscale
Synology Hyper Backup Destination Offline over Tailscale →
Synology Tailscale Connected but NAS Is Unreachable →
Synology Tailscale Subnet Router: LAN Device Unreachable →
Tailscale Connection Stuck on DERP Relay →
Tailscale Exit Node Is Connected but There Is No Internet →
Tailscale MagicDNS Name Fails While the Tailscale IP Works →
iXsystems
TrueNAS SCALE
TrueNAS SCALE SMB Share Exists but Client Access Is Denied →
Unraid
Unraid OS
wireguard-tools project
WireGuard
Z-Wave JS project
Z-Wave JS
Zigbee2MQTT project
Zigbee2MQTT
Only products with current published troubleshooting content appear in this index. For a symptom-first view, use the problem library.