Troubleshooting Nightscout

Before troubleshooting

Check your email (maybe you missed an important announcement)
Check your internet provider / SIM credit (can all devices browse internet?)
Try another browser/computer (if building your Nightscout site)

Overall third party services

Check the services you’re using are available

Vendor	Check here:
Dexcom Dexcom US account Dexcom non-US account	https://status.dexcom.com/ https://clarity.dexcom.com/ https://clarity.dexcom.eu/
Carelink US account Carelink non-US account	https://carelink.minimed.com/ https://carelink.minimed.eu/app/login
GitHub	https://www.githubstatus.com/
Heroku	https://status.heroku.com/
Railway	https://railway.instatus.com/
MongoDB Atlas	https://status.cloud.mongodb.com/
Northflank	https://status.northflank.com/
Azure	https://azure.status.microsoft/
NS10BE	https://ns.10be.de/en/status.html

Application crashed

Not knowing if it’s a permanent issue, first try to restart it…

Heroku

Restart all dynos

Railway/Northflank/Azure/Fly.io

Modify any variable (best choice is CUSTOM_TITLE) to force restart

Render

Restart service

GitHub

Follow these instructions.

Heroku

Search your issue there.

There’s nothing here, yet can be due to billing issues.

An Application error means Heroku crashed. Restart it and check database size.

Atlas

Issues during database creation look there.

The usual reason for failure at build time is a bad connection string (Atlas).

If you encounter a Boot Error - Unable to connect to Mongo it might be due to a Database Full

Railway

Mind you can’t deploy Railway if you just created a new GitHub account.

Nothing there is usually because you forgot to subscribe to a Developer plan.

Else go there.

Fly.io

Fly.io troubleshooting is complex if you didn’t make your app maintainable.

Once done, issues are most probably due to your fly.toml contents or variables.

Other issues

Reports

Reports slow loading or timeout

No data in Nightscout

Check your uploader is configured correctly.

Make sure your Nightscout time zone is correct.

If you use a DIY closed loop system make sure it’s setup correctly.

Dexcom data not showing

See this dedicated page.

Dexcom or CareLink data stopping after a while

Hint

CareLink with mmconnect data source stopped functioning for 7xx pumps. **Remove the mmconnect plugin from ENABLE.

First verify you can see your BG in Clarity.

If you’re using Heroku, check the web app is not sleeping.
You might need to setup an Uptime robot for Heroku Eco plan and Render.

UpTime Robot

Using an uptime robot with a bad password, or other issues originating from Nightscout can lead to a locked account (Dexcom).

Data timing issues

Basal is shifted in time

Check the time zone is correct for your currently active profile in your Nightscout Profile editor.

Data in the future

Check you don’t have data in the future with the Admin tools. Remove them if existing.

If this isn’t working, or shows no future data, check in your database (Atlas see here)

Basal / IOB / COB missing after DST

Setup again your time zone in profile editor (authenticate and save).

Error code instead of a BG value

Nightscout implements Dexcom error codes as listed below:

Code	Corresponding error
`?SN`	Sensor not active
`?MD`	Minimal deviation
`?NA`	No antenna
`?NC`	Sensor not calibrated
`?CD`	Counts deviation
`?AD`	Absolute deviation
`???`	Power deviation
`?RF`	Bad RF