IDMSA a cryptic acronym used as the collective name of the group of computer servers — computers larger, faster, and with more resources and capabilities for the billions of network connections happening — used to provide authentication services for controlling and accessing Apple apps and services. That includes the authentication services used to allow (or deny) access here to this Apple Communities.
Much like the network host names you have assigned to your own local computers and other devices, or the network host names that have been automatically generated and assigned, idmsa.apple.com is a network host name.
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