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Hi @JanNuaman-2253 ,
it's not recommended to connect the test infrastructure with the productive on-premises environment to run ping and connection tests.
During the test migration the productive application server is still running, There will be conflicts if both network infrastructures will be connected (application server VMs with the same name but different IPs, .....).
The only option to run all tests in the test environment is to deploy all required VMs, for instance AD DCs, DB servers in the test environment.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten