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https://ajitpatra.com/2018/10/20/azure-error-while-connecting-to-azure-sql-server-cannot-open-server-requested-by-the-login-client-with-ip-address-is-not-allowed-to-access-the-server/
Azure: Error while connecting to Azure SQL Server "Cannot open server '...' requested by the login. Client with IP address '...' is not allowed to access the server"