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Blocking the ID from connecting would block it from receiving the mandated encryption strength policy setting which will cause it to silently and automatically upgrade. You should be using policies to mandate the desired encryption strength. https://help.hcltechsw.com/domino/14.0.0/admin/conf_configuringencryptionforidfiles_t.html
The ID file is >locally< encrypted with a defined encryption strength. For network transactions the ID file encryption strength does not matter.