SIRIS, ALTO, and NAS: Device Web: "An error occurred..."



When you try to remotely connect to your Datto appliance's GUI, you see the error message, "An error occurred..."


  • Datto SIRIS
  • Datto ALTO
  • Datto NAS


  • The backup appliance is unable to communicate with Datto's Remote Web servers.


Datto appliances communicate with a distributed, global network of communication nodes to check in with cloud servers and enable remote management. If your Datto appliance is unable to communicate with this network, Device Web access will fail.

To resolve the issue described in this article, perform the following steps:

1. Ensure that your Datto device is powered on and connected to your network.

2. Ensure that the Datto appliance's networking environment meets Datto's whitelist requirements for communication with the Remote Web server:

  • IP ranges
    •, port 443 and port 80
    •, port 80
  • Domains: dlt-rly-* / fra-rly-* / syd-rly-* (* is a wild card; these domains will continue to expand)

3. Attempt remote access to your device again.

Additional Resources

Was this article helpful?

0 out of 0 found this helpful

You must sign in before voting on this article.

Want to talk about it? Have a feature request?

Head on over to our Datto Community Forum or the Datto Community Online.

For more Business Management resources, see the Datto RMM Online Help and the Autotask PSA Online Help .

Still have questions? Get live help.

Datto Homepage