The Portal for ArcGIS Security 2018 Update 1 Patch has been released for Portal for ArcGIS 10.5.1. Patches for Portal for ArcGIS 10.4.1 and 10.3.1 will be released on this same page as they are available.
Security patches are released for the last minor release in a series of ArcGIS products that are still in mainstream support.
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