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What causes intermittent DNS resolution failures on a Pi-hole running behind a pfSense firewall, and how do I troubleshoot upstream forwarding?

ChatGPTgpt-62 queries11/1/2026
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Fan-out diagram

The searches the AI actually ran for this prompt.

SEED QUERY
What causes intermittent DNS resolution failures on a Pi-hole running behind a pfSense firewall, and how do I troubleshoot upstream forwarding?
2 real searches · 1 real-search pass
Pi-hole documentation upstream DNS troubleshooting conditional forwarding DNS resolution timeoutGoogle ↗
OBSERVED
Netgate pfSense DNS Resolver forwarding mode DNS Forwarder documentation outbound DNS firewall rulesGoogle ↗
OBSERVED

Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.

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Classifying 2 queries…

Searches and sources

ChatGPT2 real searches · gpt-6
Pi-hole documentation upstream DNS troubleshooting conditional forwarding DNS resolution timeout Google ↗
Netgate pfSense DNS Resolver forwarding mode DNS Forwarder documentation outbound DNS firewall rules Google ↗
  1. DNS Resolver Mode · docs.netgate.com
  2. General Configuration Options · docs.netgate.com
  3. DNS Resolver Configuration · docs.netgate.com
  4. Troubleshooting DNS Resolution Issues · docs.netgate.com

Queries

2 queries · click a column to sort
Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
Pi-hole documentation upstream DNS troubleshooting conditional forwarding DNS resolution timeout
OBSERVED
Google ↗
AI Mode ↗
————1x
of 1
Netgate pfSense DNS Resolver forwarding mode DNS Forwarder documentation outbound DNS firewall rules
OBSERVED
Google ↗
AI Mode ↗
————1x
of 1