# Troubleshooting Open Sessions without Data

This guide offers steps to diagnose and resolve "0 byte" data transfer issues for connected devices in Monogoto network, covering configuration tips, and connection validation techniques.

## Symptoms:

* The device shows as connected in the [Monogoto hub](http://hub.monogoto.io), but no data is transmitted or received.
* The device may respond to network registration checks but fails to establish a working data session.

## Make sure:

* Your device is powered on and attempting to connect 
* Your device has the APN set as data.mono

## Troubleshooting Steps:

Once you’ve checked the above, here are additional top 5 troubleshooting tips.

1. Check PDP context\
   `AT+CGACT?`  ➔ This will show if a PDP context is active.

2. Check IP address assignment\
   `AT+CGPADDR`   ➔ If the IP address is 0.0.0.0, the context is likely not properly established.

3. Confirm APN configuration (ensure the correct APN is set for Monogoto)\
   `AT+CGDCONT=1,"IP","data.mono"`  ➔ Misconfigured APN settings are a common cause

4. Firewall and routing issues\
   Confirm that the device is authorized to communicate over the configured APN. Ensure firewall rules on the network are not blocking traffic.<br>

5. Session reset - Manually reset the PDP context
   * `AT+CGACT=0,1`
   * `AT+CGACT=1,1`

Lastly, you should monitor your account to confirm data sessions within [your SIMs events](https://docs.monogoto.io/backup-of-advanced-console/platform/how-to-check-if-thing-is-connected/checking-thing-connection-via-event-logs).

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