iam: add firewall SSO FAQ (#21863)

## Description
- Added question and answer to SSO FAQs about firewall rules during SSO
config
- This question was asked in Kapa and Kapa returned an uncertain
response since we do not cover this in existing docs
- This will add a source for Kapa and allow me to improve the answer

## Related issues or tickets
[ENGDOCS-2385](https://docker.atlassian.net/browse/ENGDOCS-2385)

## Reviews
- [ ] Editorial review

[ENGDOCS-2385]:
https://docker.atlassian.net/browse/ENGDOCS-2385?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

---------

Co-authored-by: Allie Sadler <102604716+aevesdocker@users.noreply.github.com>
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Sarah Sanders 2025-01-22 08:20:12 -08:00 committed by GitHub
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@ -58,3 +58,7 @@ other sensitive data in the directory. Due to potential security risks, Docker
doesn't support this configuration. Instead, Docker recommends [configuring SCIM
to enable group sync
securely](/security/for-admins/provisioning/group-mapping/#use-group-mapping-with-scim).
### Are there any firewall rules required for SSO configuration?
No. There are no specific firewall rules required for configuring SSO, as long as the domain `login.docker.com` is accessible. This domain is commonly accessible by default. However, in rare cases, some organizations may have firewall restrictions in place that block this domain. If you encounter issues during SSO setup, ensure that `login.docker.com` is allowed in your network's firewall settings.