Introduction

The “Underlying connection was closed” error is a very general error that can be caused by a number of different things. In most cases, it indicates that the server you are trying to connect to is not responding properly. However, it can also be caused by problems with your computer’s network configuration or with the server’s configuration.

What is the error?

The underlying connection was closed: An unexpected error occurred on a send.

This error message may occur if the client or server computer is unable to establish a communication link due to network problems or firewall restrictions.

What causes the error?

The error can be caused by a number of things, but the most common cause is that the server you are trying to connect to is using a self-signed SSL certificate. When you try to connect to a server that is using a self-signed SSL certificate, your browser will show you a warning message saying that the connection is not secure.

How to fix the error?

The first thing you should do is check your internet connection. If you’re using a mobile device, make sure you’re connected to a reliable Wi-Fi network. If you’re using a computer, try connecting to a different network and see if that fixes the issue.

If the problem persists, the next step is to clear your browser’s cache and cookies. This can help resolve issues caused by corrupted data in your browser’s cache.

If you still can’t fix the error, contact your internet service provider or the website you’re trying to access and let them know of the issue.

Conclusion

We have now looked at the various components of an error message, “The underlying connection was closed: An unexpected error occurred on a send.” We have also seen that there are a few potential causes for this error, and a few potential solutions. In conclusion, this error can be caused by a number of things, but is most likely due to either a problem with the computer’s .NET Framework, or a problem with the server that is hosting the web service. If you are encountering this error, we recommend that you first check to see if your computer’s .NET Framework is up to date, and then secondly contact the support team for the web service in question.