<div class="content"><p> </p><p>The <b>RfrGetFQDNFromServerDN</b> method returns the <span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_604dcfcd-72f5-46e5-85c1-f3ce69956700" data-linktype="relative-path">Domain
Name System (DNS)</a></span> <span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_1769aec9-237e-44ed-9014-1abb3ec6de6e" data-linktype="relative-path">FQDN</a></span> of the server
corresponding to the passed <span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_1175dd11-9368-41d5-98ed-d585f268ad4b" data-linktype="relative-path">DN</a></span>.</p><dl>
<dd>
<div><pre> // opnum 1
 long RfrGetFQDNFromServerDN(
    [in]                                     handle_t           hRpc,
    [in]                                     unsigned long      ulFlags,
    [in, range(10,1024)]                     unsigned long      cbMailboxServerDN,
    [in, string, size_is(cbMailboxServerDN)] unsigned char   *  szMailboxServerDN,
    [out,ref,string]                         unsigned char   ** ppszServerFQDN);
</pre></div>
</dd></dl><p><b>hRpc:</b> A <span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_8a7f6700-8311-45bc-af10-82e10accd331" data-linktype="relative-path">remote procedure call (RPC)</a></span>
<span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_44deb72d-c62b-4335-90e4-b9fd4dd782ed" data-linktype="relative-path">binding
handle</a></span> parameter, as specified in <span><a href="https://go.microsoft.com/fwlink/?LinkId=89824" data-linktype="external">[C706]</a></span> section
2. MUST NOT be NULL.</p><p><b>ulFlags:</b> An unsigned long value, containing a set of
bit <span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_425bcab9-7911-4eae-b414-624b7a51eb5f" data-linktype="relative-path">flags</a></span>.
Unused; SHOULD be set to zero. Other values MUST be ignored by the server.</p><p><b>cbMailboxServerDN:</b> An unsigned long value containing
the number of bytes in the value of the <b>szMailboxServerDN</b> parameter,
including terminating NULL character. The value is at least 10, at most 1024.</p><p><b>szMailboxServerDN:</b> A 5 or 6-element DN identifying a <span><a href="8a0b2177-60de-4dca-b815-9d83663dfff4#gt_d3ad0e15-adc9-4174-bacf-d929b57278b3" data-linktype="relative-path">mailbox</a></span>
server, which MUST match the server&#39;s implementation of server identities. It
follows this format: </p><dl>
<dd>
<div><pre> &#34;/o=&#34; organization-name &#34;/ou=&#34; administrative-group-name &#34;/CN=configuration/CN=servers/CN=&#34; instance-name &#34;/CN=&#34; short-messaging-server-name
</pre></div>
</dd></dl><p>The <code>CN=&#34; instance-name &#34;</code>
element is optional.<a id="Appendix_A_Target_3"></a><a id="z7"></a><a aria-label="Product behavior note 3" href="9a225804-1148-4d0f-921f-0b0724c000f8#Appendix_A_3" data-linktype="relative-path">&lt;3&gt;</a></p><p>Note that the client MAY receive a DN identifying a specific
database on this server, from sources listed in section <span><a href="7d41ff2d-0b7c-4acc-9dbf-32e5ad8c1e59" data-linktype="relative-path">1.6</a></span>.
This DN follows this format:</p><dl>
<dd>
<div><pre> &#34;/o=&#34; organization-name &#34;/ou=&#34; administrative-group-name &#34;/CN=configuration/CN=servers/CN=&#34; instance-name &#34;/CN=&#34; short-messaging-server-name &#34;/CN=Microsoft Private MDB&#34; 
</pre></div>
</dd></dl><p>Or</p><dl>
<dd>
<div><pre> &#34;/o=&#34; organization-name &#34;/ou=&#34; administrative-group-name &#34;/CN=configuration/CN=servers/CN=&#34; instance-name &#34;/CN=&#34; short-messaging-server-name &#34;/CN=Microsoft Public MDB&#34; 
</pre></div>
</dd></dl><p>If this is the DN available, it is the client&#39;s
responsibility to remove the final element before passing the DN to the <b>RfrGetFQDNFromServerDN</b>
method.</p><p><b>ppszServerFQDN:</b> A string. If the server does not
return an error, the <b>ppszServerFQDN</b> parameter contains the FQDN of the
mailbox server identified by the <b>szMailboxServerDN</b> parameter.</p><p><b>Return Values:</b> The server returns 0 for a successful
execution. An error results in an HRESULT or other nonzero error code.</p><p><b>Exceptions Thrown:</b> No exceptions are thrown beyond those
thrown by the underlying RPC protocol as specified in <span><a href="/en-us/openspecs/windows_protocols/MS-RPCE/290c38b1-92fe-4229-91e6-4fc376610c15" data-linktype="absolute-path">[MS-RPCE]</a></span>.</p><p>The server MUST process the data from the client using the
following constraints when receiving this message. The method MUST perform some
lookup to determine the FQDN of the server identified by the <b>szMailboxServerDN</b>
parameter. After considering these constraints, this method SHOULD return one
mailbox server name in the <b>ppszServerFQDN</b> parameter and 0 as a return
value. If any errors occur and the method is not able to return the name of a
mailbox server, a failing HRESULT SHOULD be returned.</p></div>