Microsoft KB Archive/251509

= XFOR: Cannot Restrict Access by Domain Name if DNS Is Not Configured Correctly =

Article ID: 251509

Article Last Modified on 2/26/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition

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This article was previously published under Q251509





SYMPTOMS
When you use a domain name to restrict access to an IMAP or POP3 virtual server, you need a pointer (PTR) record for that domain in Domain Name System (DNS). Otherwise, the restriction does not work because Exchange 2000 cannot perform a DNS reverse lookup successfully to obtain the fully qualified domain name (FQDN).



MORE INFORMATION
The PTR record is a resource record that is used in a reverse lookup zone that is created within the in-addr.arpa domain to designate a reverse mapping of a host IP address to a host DNS domain name.

To add a pointer (PTR) resource record to a reverse zone:
 * 1) Click Start, point to Programs, point to Administrative Tools, and then click DNS.
 * 2) In the console tree, click the applicable reverse lookup zone.
 * 3) On the Action menu, click New Pointer.
 * 4) In the Host IP number text box, type the host IP address octet number.
 * 5) In the Host name text box, type the fully qualified domain name for the DNS host computer for which this pointer record is to be used to provide reverse lookup (address-to-name resolution).

As an option, you can click Browse to search the DNS namespace for hosts in this domain that have host (A) records already defined.
 * 1) Click OK to add the new record to the zone.

Keywords: kbprb KB251509

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