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This Esri document also lists which clients require update/fixes to support TLS 1.2, including what Esri products and a list of older browsers.

Esri has also established a support page to help customers at

How will this affect Nearmap users?

When you try add a layer from ArcGIS Online, and your application hasn't been updated, you may get an error similar to this one:

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To fix this connecting to ArcGIS Online via ArcMap:

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You may encounter the following error:

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To fix this you will need to update your software with the patch as described in: Install the TLS 1.2 patch on ArcGIS Desktop.