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NewAuth built a fresh in-memory config on every call via CreateInMemoryConfig, which generates a new WireGuard private key when none is set. The iOS Swift layer calls this on interactive re-login and writes the resulting config back to the profile's netbird.cfg, so each re-auth replaced the peer's persisted private key with a new one. A new key means a new public key, so the management server registered a brand-new peer on every re-authentication — named after the fallback hostname. Load the existing config with DirectUpdateOrCreateConfig when a config file is already present so re-login reuses the peer's persisted private key (and its identity). Only fall back to a fresh in-memory config for the first-time login when no config file exists yet (or after logout, which deletes the file). DirectUpdateOrCreateConfig uses non-atomic writes so it also works inside the tvOS App Group sandbox. This matches what Run() and LoginForMobile() already do. ## Describe your changes ## Issue ticket number and link ## Stack <!-- branch-stack --> ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) - [ ] This change does **not** modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — **OR** I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See [CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first). > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__ <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added support for loading or creating persistent configuration when a configuration file path is provided. * Continued support for in-memory configuration for temporary or first-time use. <!-- end of auto-generated comment: release notes by coderabbit.ai -->