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Article ID: 317099 - Last Review: July 7, 2008 - Revision: 6.1
PRB: "550 Quoted Name Does Not Match IP Address" SMTP Error Message
This article was previously published under Q317099
We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:
For more information about IIS 7.0, visit the following Microsoft Web site:
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:
username@domainname.com
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 sourceFQDN
the remote SMTP server returns the following
response to the local SMTP server:
550 Quoted name does
not match IP Address
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.
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:
- In the Microsoft Management Console (MMC), click SMTP Site Properties.
- Click the Delivery tab.
- Type the proper string in the Fully-qualified domain name box.
- Click OK.
This
behavior is by design.
APPLIES TO
- Microsoft Internet Information Server 4.0
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- Microsoft Internet Information Services 6.0
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