In the current era where companies’ mergers and take over is a common phenomenon, it is possible to run into a situation where there are two domains which are connected but not trusted. I was engaged in consulting for a client who had a similar merger in the past. The reporting application was in a different domain and they wanted data to be synchronized in SQL Server database on parent domain. Essentially, they had two windows clusters and they want to have one AG across them. The only solution which came to my mind was Distributed Availability Group in SQL Server. To make things little more complicated, they did not want to use certificates to configure this setup. As per them, certificates will add an overhead of maintenance. Here is the oversimplified diagram of their deployment.
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