DOCUMENT:Q317099 06-AUG-2002 [iis] TITLE :PRB: "550 Quoted Name Does Not Match IP Address" SMTP Error Msg PRODUCT :Internet Information Server PROD/VER::4.0,5.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server versions 4.0, 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When you send e-mail messages to remote Simple Mail Transfer Protocol (SMTP) servers, you may receive the following error message: 550 Quoted name does not match IP Address On the local SMTP server that sent the e-mail message, a file that has the .rtr file name extension and that is associated with the e-mail message contains the following lines: Remote connection was abruptly disconnected. In a Network Monitor trace of this scenario, after the local SMTP server [sourceIP:3768] sends the EHLO command to the remote SMTP server [destinationIP:25], as follows EHLO the remote SMTP server returns the following response to the local SMTP server: 550 Quoted name does not match IP Address CAUSE ===== On public DNS servers, the A record for the source fully qualified domain name (FQDN) does not point to the source IP address that is owned by the source mail server. This kind of problem typically occurs when Network Load Balancing (NLB) or the Microsoft Windows NT Load Balancing Service (WLBS) is involved. With NLB or WLBS, the FQDN is mapped to the virtual IP address that is used to implement load balancing. The remote SMTP server enables a feature to perform reverse DNS queries, and rejects the requests from the IP address that does not match the FQDN name that it claims. Therefore, the source FQDN of the virtual name does not match the real IP address of one node in the NLB or WLBS because it points to the virtual IP address of the NLB or WLBS. RESOLUTION ========== To resolve this problem, use either of the following methods: - On the source server, change the DNS records so that the source FQDN matches the source IP address. - For NLB or WLBS, follow these steps to create individual DNS records in the DNS server for each node, and then change the FQDN setting for each node to individual the FQDN name in the SMTP service: 1. In the Microsoft Management Console (MMC), click SMTP Site Properties. 2. Click the Delivery tab. 3. Type the proper string in the Fully-qualified domain name box. 4. Click OK. STATUS ====== This behavior is by design. Additional query words: WLBS NLS IIS SMTP 550 ====================================================================== Keywords : Technology : kbiisSearch kbiis500 kbiis400 Version : :4.0,5.0 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.