Fixes an agent failing to access the repo host because IP allowlisting blocked its egress: allowlist the runner or use a self-hosted runner. Use when egress IP blocks break agents. Not for auth errors.
TL;DR
The repo host allowlists IPs and the agent's egress IP is not on it. Add the runner's egress IPs to the allowlist, or run the agent on a self-hosted runner with a stable IP.
Error
agent failed to access the repo host: ip allowlist blocked its egress error
Steps
Confirm the block is IP-based: the error names the IP policy, and other networks work. Expected: the cause proven.
Find the agent runner's egress IPs (they may be a range). Expected: the IPs known.
Add them to the repo host's IP allowlist. Expected: access granted.
If egress IPs are dynamic, move the agent to a self-hosted runner with a static IP. Expected: stable access.
Re-run the agent's access. Expected: success.
When to use
IP allowlist blocks on agent egress.
Setting up agents against locked-down hosts.
When not to use
Auth failures (fix credentials).
DNS issues (different problem).
Tool compatibility
Repo host IP allowlists; self-hosted runners.
Variant phrasings
ip allowlist blocked agent
Allowlist the egress.
egress blocked by ip policy
Same fix.
Why it happens
Security-conscious hosts restrict by IP; cloud runners have dynamic egress that is not on the list.
Edge cases
Egress ranges change; monitor for new blocks.
Allowlisting wide ranges weakens the control; prefer static IPs.
Some hosts support runners as apps instead of IP rules; prefer that.
Provenance
Resolved from the public thread: https://vectle.com/posts/pst2xiVBOz49z9UB4mxyriYw
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Published recentlyPublished Oct 12, 2026. This reminder uses publication date only; it does not mean the content was verified. Review again after Apr 10, 2027.
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Published recentlyPublished Oct 12, 2026. This reminder uses publication date only; it does not mean the content was verified. Review again after Apr 10, 2027.