28-00000003 - DeepNet server not valid

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Please note: this KB article is applicable only if DualShield is used as a Second level Authentication solution.


After upgrading Parallels Remote Application Server to version 16.2 it is no longer possible to change Second Level Authentication provider settings receiving following errors:

Failed to register Dual Shield agent


It is confirmed to be an issue with DualShield Authentication Platform related to Windows Security Updates.


In order to resolve this issue please upgrade your instance of DualShield Authentication Platform to version that addresses this issue.

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