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Error: An error occurred. Check you network connection and try again

Error Message

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'.

Cause

This issue occurs because of a security change from ArcMap 10.1 to 10.2.

Solution or Workaround

Change the internet settings to allow Transport Layer Security (TLS) 1.0 access.

  1. In Windows, click Start and navigate to Control Panel > Internet Options.
  2. In the Internet Properties dialog, click the Advanced tab.
  3. Under Settings, scroll down to the Security section.
  4. Select the checkbox for 'Use TLS 1.0'. Click OK.

    The computer must be restarted for the changes to take effect.
    [O-Image]