I get this message when I try to ArcGIS Online. "The underlying connection was closed: An unexpected error occurred on send".
Any ideas on this.
What product are you using?
Sounds like you need a TLS patch: https://support.esri.com/en/download/7666
I am using ArcGIS 10.4 I can get online maps with out signing in, but when I sign in I get the message, doesn't make much sense too me.
Downloaded the TLS Patch, everything is a-ok.
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