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check if the host is reachable: ping <database server>
check if port is accessible: telnet <database server> <port>
verify with your IT team if firewall rules are set properly between database server and In-Place Masking one.
Environments. Add the previously created “Data Source” to the masking environment
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Push “Add Environment” button and choose schemas, tables you would like to scan
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When you chose your “Data Source” the application will present you with schemas/databases where you can choose some of them or all of them.
You may also use “Select Tables” button, so you may include a subset of tables in scan.