> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/support-uk/t650/errors/error-t703-no-connection-to-host.md).

# Error T703 – No Connection to Host

What to do when a T650 shows Error T703 (No Connection to Host) after a failed transaction.

{% hint style="info" %}
**Use this page when** the terminal displays **Error T703 – No Connection to Host** after a transaction fails because it couldn't connect to our server.
{% endhint %}

<details>

<summary>Keywords</summary>

Also called: T703, No Connection to Host, connection error, host error, can't connect to host, transaction failed. Search terms: T703, no connection to host, host, connection, APN, SIM, GPRS, mobile data.

</details>

## Symptoms

You may see:

* The terminal displays **Error T703 – No Connection to Host**.
* A transaction fails because the terminal can't reach the server.
* The error appears straight after attempting a sale.

**Most likely cause:** the terminal can't reach the Verifone host — usually a mobile data (APN) or SIM connectivity problem.

## Resolution

{% stepper %}
{% step %}

### Run the SAF Diagnostic

Clear any pending reversals by following [How to Run the SAF Diagnostic](/support-uk/t650/how-tos/how-to-run-the-saf-diagnostic.md), then reattempt the transaction.

✅ **Issue fixed — stop here.** ❌ **Still not working — continue to Step 2.**
{% endstep %}

{% step %}

### Check the APN credentials

The terminal connects over mobile data, so an incorrect APN will stop it reaching the host. Follow [How to Set Up Mobile Data](/support-uk/t650/how-tos/how-to-set-up-mobile-data.md) to check the APN is set correctly for the SIM card:

* **Telenor SIM:** `verifone.inc.cxn`
* **KPN SIM:** `mobius.m2m`

Leave the **Username** and **Password** fields empty, then reattempt the transaction.

✅ **Issue fixed — stop here.** ❌ **Still not working — continue to Step 3.**
{% endstep %}

{% step %}

### Test on Wi-Fi

Connect the terminal to a Wi-Fi network — a personal hotspot is fine for testing. See [How to Set Up Wi-Fi](/support-uk/t650/how-tos/how-to-set-up-wi-fi.md), then reattempt the transaction.
{% endstep %}
{% endstepper %}

**If the transaction works on Wi-Fi.** The SIM card is at fault. [Contact Verifone Support](https://my.verifone.com/s/supportbyemail) to raise the SIM card for replacement.

**If it still fails on Wi-Fi.** Continue to the contact details below.

## Still not working?

{% hint style="info" %}
**Still need help? Contact Verifone Support.**

If the steps above haven't resolved the issue, [contact Verifone Support](https://my.verifone.com/s/supportbyemail). Tell us the troubleshooting steps you've already tried — it helps us get you to the right support faster.
{% endhint %}


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