> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/boomerang-3-calibration-app-manual/troubleshooting/no-contact-with-boomerang-3.md).

# No contact with Boomerang 3

If there is no contact with Boomerang 3 server when the app communicates with it, “PENDING” and “TIMEOUT” are shown in the B3 status line. The app communicates with B3 when:

* MP shall be selected for calibration which reads a list of measuring points from the server,
* the app reads B3 measurements or sends the adjustment and certificate to B3 server during [Finalise calibration](/boomerang-3-calibration-app-manual/performing-the-calibration/finalise-calibration.md),
* [Discard calibration](/boomerang-3-calibration-app-manual/performing-the-calibration/discard-calibration.md) or [Recalibrate](/boomerang-3-calibration-app-manual/performing-the-calibration/recalibrate.md) is selected.

In such a case:

* log out and log in again,
* check your Internet connection.


---

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