title: Issue in connecting to Oracle DB from AWS DMS
body: <p>I want to run a  DMS task to copy data from on premises Oracle DB to Mysql on AWS.
  I have already got firewall access and am able to telnet to the oracle DB server from AWS ec2 instances. Also, I can login into the DB using the same username/pwd, connection string from sql developer
  But when I test my endpoint on DMS , then it fails with below error.</p>
  
  <p>FYI, the DMS instance falls in the same VPC for which I have got the firewall clearance.</p>
  
  <pre><code>Test Endpoint failed: Application-Status: 1020912, Application-Message: ORA-12545: 
  Connect failed because target host or object does not exist OCI connection failure.,
   Application-Detailed-Message: ORA-12545: Connect failed because target host or object does not exist
   OCI connection failure. ORA-12545: Connect failed because target host or object does not exist OCI connection 
   failure. Command get_owner_list failed when creating the stream component. requested object was not found 
   in the repository. Failed getting stream handle requested object was not found in the repository. 
   create_stream_handle failed requested object was not found in the repository. 
   Getting DB object ('A4NOXXXXXXXXXK2N2U') info from repository failed requested object was not found in
   the repository. Command get_owner_list failed when creating the stream component. requested object was not
  found in the repository. Failed getting stream handle requested object was not found in the repository. 
   create_stream_handle failed
  </code></pre>
  
  <p>I checked at both network and DB end an there seems to be no issue. Please suggest.</p>