# Can not connect to Access

## Before you move on

You are here because you tried to [connect to Access](/protocols/best-practices/connect-to-access.md) but something went wrong.

Is this not the case? Then let's take a step back. [Does your BactoBox® not power on](/troubleshooting/power-on-fails.md)? [Does the *QC test* program give errors](/troubleshooting/qualification-fails/i-get-error-40xx.md)?

See also [BactoBox® acting up?](/troubleshooting/bactobox-r-acting-up.md).

<img src="/files/4YvqkQVU1cELIaUHIgWW" alt="" class="gitbook-drawing">

## ***This site can't be reached*****&#x20;with `ERR_CONNECTION_REFUSED`**

<figure><img src="https://sbtinstruments.com/wp-content/uploads/2025/01/Chrome-cant-be-reached-ERR_CONNECTION_REFUSED.png" alt=""><figcaption><p>Error message when you try to connect to Access.</p></figcaption></figure>

The error message indicates that the physical connection works and there *is* some connectivity. However, something blocks the connection attempt. Let's figure out what is wrong:

1. Ensure that you use **HTTP** and *not* **HTTPS**. Click the address bar and type out[ **http://10.20.30.40**](http://10.20.30.40) as shown in the image below. Press enter to see if it works.\
   ![](https://sbtinstruments.com/wp-content/uploads/2025/01/Chrome-http-over-https.png)
2. Try again with another computer. It could be that a local system setting blocks the connection.
3. Corporate firewall settings may block the connection. If that is the case, you have to contact your IT department and ask them to allow connections to 10.20.30.40 on port 80 over TCP.

## ***This site can't be reached*****&#x20;with `ERR_CONNECTION_RESET`**

<figure><img src="https://sbtinstruments.com/wp-content/uploads/2025/01/Chrome-cant-be-reached-ERR_CONNECTION_RESET.png" alt=""><figcaption><p>Error message when you try to connect to Access.</p></figcaption></figure>

The error message indicates that the physical connection may be broken, or, that there is a software issue. Let's figure out what is wrong:

1. Ensure that there is a *BactoBox* folder in Windows Explorer. If the *BactoBox* folder exists, the physical connection works. If not, check that:
   1. The USB cable is connected firmly to both BactoBox® and your computer.
   2. Check the USB cable for damage due to, e.g., wear and tear. Often this occurs near the connectors at both ends.
2. Test that the USB port on your computer works with other devices. E.g., try to insert a USB thumb drive to test that the USB port itself works.
3. Ensure that the *BactoBox* folder in Windows Explorer contains *both* the *SBT Access.html* and *summary.csv* files. If there is only one file, it's a sign that something is not working as it should. [Contact our support team](/troubleshooting/contact-our-support-team.md) for further troubleshooting. Make sure to mention it if, e.g., *summary.csv* is missing.


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