A Zero Downtime Migration Port Requirements

The ports required for communication between the Zero Downtime Migration service host, the source and target database servers, and Oracle Cloud Object Store Service are described in the following table.

Table A-1 Zero Downtime Migration Communication Ports

Initiator	Target	Protocol	Port	Purpose	Description
Zero Downtime Migration service host	Source and target database servers	TCP	22	SSH	Authentication-based operations to run Zero Downtime Migration operational phases Source and target database servers should accept incoming connections from the Zero Downtime Migration service host. Not applicable to Autonomous Database targets
Zero Downtime Migration service host	Source and target database servers	TCP	1521, 2484, or a database SCAN Listener port applicable for job	SQL*Net	For logical migrations
Zero Downtime Migration service host	Oracle Cloud Interface REST endpoint	SSL	443	OCI REST endpoint	Target discovery for logical migrations
Source database servers	Target database servers	TCP	1521 or database SCAN Listener port applicable for the job	SQL*Net	Should allow Oracle client connections to the database over Oracle's SQL*Net protocol Perform database queries, Data Guard sync, and configuration Note: If you are using a non-default port number (that is, something other than port 1521) for the local listener address, then the non-default port should allow connections.
Target database servers	Source database servers	TCP	1521 or a database SCAN Listener port applicable	SQL*Net	Should allow Oracle client connections to the database over Oracle's SQL*Net protocol Allows redo log shipping if source database needs to be in sync with the new primary on Oracle Cloud after switchover. If there is no communication possible from Oracle Cloud to source database server then set SKIP_FALLBACK to TRUE in the response file to avoid this communication. Note: If you are using a non-default port number (that is, something other than port 1521) for the local listener address, then the non-default port should allow connections.
Source database servers	Oracle Cloud Object Store Service	SSL	443	Database backup store. Create a backup of the source database to the specified Oracle Cloud Object store container.	If the chosen backup method uses Oracle Cloud Object Store Service as the backup medium, then access ports as documented Oracle Cloud Object Store Service applies.
Target database servers	Oracle Cloud Object Store Service	SSL	443	Database backup store. Restore backup of the source database from the specified Oracle Cloud Object store container to the target database.	If the chosen backup method uses Oracle Cloud Object Store Service as the backup medium, then access ports as documented Oracle Cloud Object Store Service applies.

Note:

When performing a migration with root credentials (migrate database -scroot), during the setup phase, Zero Downtime Migration uses six ports chosen from the ephemeral range, or six ports from the range of ports set in TRANSFERPORT_RANGE in zdmbase/crsdata/zdm_service_host/rhp/conf/rhp.pref. The specified ports must be allowed to accept incoming connections from the Zero Downtime Migration service host on the source or target database server.