I am trying to connect to ArcGIS online from my desktop version of Arcmap. This worked yesterday but will not work today. I am receiving the following error message
The underlying connection was closed. An unexpected error occurred on a send.
I have tried closing and re-opening the mxd file and also signed out and back into my ArcGIS account. Nothing works.
Please help if you are able.
Hello and good afternoon!
My initial question for you is, can you verify whether or not you have the necessary TLS 1.2 Desktop Patch (https://support.esri.com/en/download/7666) installed on your machine? While I'm not sure if an absence of this patch would explain why you were able to connect yesterday and aren't able to connect today, it's still necessary to have if you plan on pulling basemaps, services, etc. from ArcGIS Online.
Hope to hear back soon,
Thank you for the update!
Perhaps there was some kind of network issue occurring, which prevented you from accessing ArcGIS Online from ArcMap. In the future, if this ever happens again, you could always try switching Networks (if that's possible). Assuming this issue happened on your work environment, you could always try your Network at home or in a public location i.e. Starbucks.
Best of luck!