An Aspera server runs one SSH server on a configurable TCP port (22 by default, but often customers use port 33001). The firewall on the server side must allow this one TCP port to reach the Aspera server. No servers are listening on UDP ports. When a transfer is initiated by an Aspera client, the client opens an SSH session to the SSH server on the designated TCP port and negotiates the UDP port over which the data will travel. By default, Aspera clients and servers are configured to use UDP port 33001. After the session initiation step, both the client and the server will send and receive UDP traffic on the negotiated port. To allow the UDP session to start, the firewall on the Aspera server side must allow port UDP 33001 to reach the Aspera server.WFor For more information, see [Firewall Considerations](https://www.ibm.com/support/pages/firewall-considerations).
The default port and only available port is 33001
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