Starting from Alder Lake platforms with Raptor Lake CPUs running Intel CSME 16.1 firmware, remote connections to Intel AMT unsecure TCP/IP ports 16992, 16994 and 623 are no longer supported. TLS ports 16993, 16995 and 664 must be used for connecting to Intel AMT. Starting from Intel CSME 19 firmware on Arrow Lake platforms, connecting to Intel AMT without TLS is not supported at all (i.e., also local connections must use TLS ports).
I hadn't noted the ME firmware version before upgrading but it must have been pre-16.1. This computer has an i7-12700 (Alder Lake) so it's a simple matter of the port I was previously using is no longer available.
isf admin
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July 6th, 2023 13:00
RESOLVED
Per Intel documentation here
Intel® AMT SDK Implementation and Reference Guide
Starting from Alder Lake platforms with Raptor Lake CPUs running Intel CSME 16.1 firmware, remote connections to Intel AMT unsecure TCP/IP ports 16992, 16994 and 623 are no longer supported. TLS ports 16993, 16995 and 664 must be used for connecting to Intel AMT. Starting from Intel CSME 19 firmware on Arrow Lake platforms, connecting to Intel AMT without TLS is not supported at all (i.e., also local connections must use TLS ports).
I hadn't noted the ME firmware version before upgrading but it must have been pre-16.1. This computer has an i7-12700 (Alder Lake) so it's a simple matter of the port I was previously using is no longer available.