ArcGIS Desktop v. 10.8.2 "The underlying connection was closed: An unexpected error occurred on a send"

[JaneDisney]

I went to add a basemap in ArcGIS Desktop and received the following error message: "The underlying connection was closed: An unexpected error occurred on a send." I am prevented from adding a basemap and accessing ArcGIS Online.

I have ArcGIS version 10.8.2; and Windows 10 Pro version 21H1.

I think this has something to do with the TLS 1.2 patch, but I can't find the appropriate patch download for the version of ArcGIS and Windows that are installed on my computer. 

Any help is appreciated! 

[Robert_LeClair · Accepted solution]

Jane - this FAQ has everything you'll need to understand and patch your computer regarding the TLS 1.2 item.

[JaneDisney]

Hi Robert, thanks for your help! I needed to download some updates I was unaware of which brought everything up to speed.