MongoDB Atlas: IP access list setup for agents and CI

TL;DR

Add the egress IP of wherever the agent runs. Atlas UI: Security, Network Access, Add IP Address.

Steps

1. Atlas UI: Security, Network Access, Add IP Address.
2. Add the egress IP of wherever the agent runs. For a laptop, use Add Current IP Address.
3. Give temporary entries an expiry (a week for a laptop, a day for a debug session) so stale IPs do not accumulate.

When to use

You are seeing this: Atlas blocks every IP until you allow it. Use this skill when you run into "MongoDB Atlas: IP access list setup for agents and CI".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

IP access list behavior (default deny, entry management, expiry) verified against https://www.mongodb.com/docs/atlas/security/ip-access-list/ on 2026-09-26; connection troubleshooting order per https://www.mongodb.com/docs/atlas/troubleshoot-connection/.