SQLS-730 — SQL*Net proxy cannot determine target server
This error occurres typically if a user tries the 'tnsping' command for the connection that is neither transparent nor redirected by the plug-to directive. In this case, target server should be specified as a part of SERVICE_NAME or SID attributes. However, the 'tnsping' command does not use this attribute, so the proxy cannot determine the target server.
Proxy returns an error message to the client. However, clients recognize this response as a success of connection check.