We are currently installing a new instance of SDL Web 8.5. During the installation, we are trying to install TMS (we are upgrading an old SDL Tridion installation).

When running the installer, we fill in the TMS connection details, however, we get the following error: "The underlying connection was closed: An unexpected error occurred on send".

enter image description here

We are able to open the url of the server address. We also installed the certificate on the new server.

Is there some configuration we are missing?

1 Answer 1


As you are using Https protocol, please specify the port number as 443 to get rid of the error and continue with installation

  • You are correct. Changing the port fixed it. Easy to miss this, as the error message isn't very clear. Commented Aug 16, 2017 at 9:58

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.