Internet Protocol Security Protocol (IPSec) is a security protocol in the network layer that provides cryptographic security services. These services support confidential delivery of data over the Internet or intranets.
On iSeries™, IPSec, a component of the Virtual Private Networking (VPN) support, allows all data between two IP addresses or port combinations to be encrypted, regardless of application (such as DRDA® or DDM). You can configure the addresses and ports that are used for IPSec. IBM® suggests using port 447 for IPSec for either DRDA access or DDM access.
Use of any valid password along with IPSec will not in general satisfy the requirement imposed by specifying PWDRQD(*ENCRYPTED) on the Change DDM TCP/IP Attributes (CHGDDMTCPA) command at the server, because the application (DRDA or DDM) will not be able to determine if IPSec is being used. Therefore, you should avoid using PWDRQD(*ENCRYPTED) with IPSec.