I’ve been working with Umbraco quite a bit lately and one thing I kept running into on one of my machines is it just wouldn’t let me install any packages. This became quite a hinderance so I finally dug into it.
I started off by digging through the logs at /App_Data/logs/ and found this error:
'{RequestUrl}'","@l":"Error","@x":"System.Net.Http.HttpRequestException: An error occurring downloading the package from https://our.umbraco.com/webapi/packages/v1/ced954d1-8c0f-4abe-bdda-99e7a787d052?version=8.14.0&includeHidden=true&asFile=true ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.\r\n at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)\r\n at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)\r\n --- End of inner exception stack trace ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n
The full stack trace is much bigger but the key piece is at the start, a SSL/TSL error. Initially I thought this was because I was running on HTTP and not HTTPS, after switching over I saw that wasn’t the case. The solution in the end was to add the following to my Global.ascx.cs file:
<script runat="server">
void Session_Start(object sender, EventArgs e)
{
System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
}
</script>
From there I stopped and restated the projet in Visual Studio in order to recycle IIS Express. After that I attempted to install a package and finally I was able to without any errors!
A seasoned Senior Solutions Architect with 20 years of experience in technology design and implementation. Renowned for innovative solutions and strategic insights, he excels in driving complex projects to success. Outside work, he is a passionate fisherman and fish keeper, specializing in planted tanks.