Note: As of April 2019, ArcGIS Online only supports TLS 1.2 connections to ArcGIS Desktop. The content in this article pertains to ArcGIS Desktop versions 10.2 and 10.3 only. Later versions contain different functionality, as well as different names and locations for menus, commands and geoprocessing tools.
When signing in to ArcGIS Online from the sign-in option in ArcMap 10.2 or later, the following error may be returned:
"An error occurred. Check you network connection and try again".
Note: This is the exact error message, with the misspelling of 'you' instead of 'your'.
This issue occurs because of a security change.
Change the internet settings to allow Transport Layer Security (TLS) 1.2 access.
Note: These settings may be managed by your system administrator.
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