Failure interpretation
If the reproducible check fails, re-check endpoint values, protocol, and local interception before blaming the target.
Proxy connection guide
What is a firewall?
What is a firewall?: definition, mechanism, reproducible checks, and what it means for dedicated static residential operation.
Quick answer
A firewall filters network traffic by rules - ports, addresses, applications.
Direct definition
How the mechanism works
Reproducible checks
Static-residential implication
When this is the right fit
- Direct definition
- How the mechanism works
- Reproducible checks
Who this page is for
What is a firewall?: definition, mechanism, reproducible checks, and what it means for dedicated static residential operation.
A firewall filters network traffic by rules - ports, addresses, applications.
How it works, step by step
- 1
Direct definition
A firewall filters network traffic by rules - ports, addresses, applications.
- 2
How it interacts with proxies
Local and network firewalls can block endpoint ports, producing refused connections and timeouts.
- 3
Static-residential implication
Allow-list your endpoints once per network; record the rules with the profile map.
- 4
Reproducible check
Probe the endpoint port before and after the firewall rule change.
Sources
Facts last reviewed 2026-09-01.
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Frequently asked questions
Does what is a firewall? matter for managed accounts?
Yes - it is one of the signals that ties a profile to one identity. Verify it in the periodic connection audit.
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