71 lines
4.7 KiB
HTML
71 lines
4.7 KiB
HTML
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<meta name="DC.Title" content="Establish a DRDA or DDM connection over TCP/IP" />
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<meta name="abstract" content="To initiate a DDM server job that uses TCP/IP communications support, the DRDA application requester or DDM source system will connect to the well-known port number 446 or 447." />
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<title>Establish a DRDA or DDM connection over TCP/IP</title>
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<body id="rbae5estcom"><a name="rbae5estcom"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Establish a DRDA or DDM connection over TCP/IP</h1>
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<div><p>To initiate a DDM server job that uses TCP/IP communications support,
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the DRDA<sup>®</sup> application
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requester or DDM source system will connect to the well-known port number
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446 or 447.</p>
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<div class="example"> <div class="fignone" id="rbae5estcom__drdaddm"><a name="rbae5estcom__drdaddm"><!-- --></a><span class="figcap">Figure 1. DRDA/DDM TCP/IP server</span><br /><div class="imageleft"><img src="rv4w205.gif" alt="This figure is described in the following text." /></div><br /></div>
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</div>
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<div class="section"><p>The DDM server also listens on port 448, but only for use with
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Secure Sockets Layer (SSL) connections, which are not supported by <span class="keyword">DB2 Universal Database™ for iSeries™</span> application requesters or
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DDM clients. <span>1</span>. The DDM listener program must have been
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started (by using the <span class="cmdname">STRTCPSVR SERVER(*DDM)</span> command, for
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example) to listen for and accept the client's connection request. The DDM
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listener, on accepting this connection request, will issue an internal request
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to attach the client's connection to a DDM server job <span>2</span>. This server
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job might be a prestarted job or, if the user has removed the QRWTSRVR prestart
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job entry from the QUSRSYS or user-defined subsystem (in which case prestart
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jobs are not used), a batch job that is submitted when the client connection
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request is processed. The server job will handle any further communications
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with the client.</p>
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</div>
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<div class="section"><p>The initial data exchange that occurs includes a request that
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identifies the user profile under which the server job is to run <span>3</span>.
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After the user profile and password (if it is sent with the user profile ID)
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have been validated, the server job will swap to this user profile as well
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as change the job to use the attributes, such as CCSID, defined for the user
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profile <span>4</span>.</p>
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</div>
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<div class="section"><p>The functions of connecting to the listener program, attaching
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the client connection to a server job and exchanging data and validating the
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user profile and password are comparable to those performed when an APPC program
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start request is processed.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbae5sockcon.htm" title="Several concepts pertain specifically to the TCP/IP communications support used by DRDA and DDM.">TCP/IP communication support concepts for DDM</a></div>
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