Category Archives: Forefront

BUG in Forefront security for exchange 2010


• We will not be able to receive emails from internet and a genuine senders will get the following NDR;
• #550 5.7.1 : host UnknownDNSName; Mail from IP banned. To request removal from this list please forward this message to
• You may get the following Event id as well in the Application log;

Log Name: Application
Source: Microsoft Forefront Protection
Date: 9/7/2010 3:18:07 PM
Event ID: 2098
Task Category: General
Level: Error
Keywords: Classic
User: N/A
The DNS Block list lookup domain could not be contacted. This will prevent DNS Block list lookups. Please verify your network connectivity.


FSE  connection filtering  DNSBL checking.



• Go for Rollup 1 or disable FSE connection filtering;

• Description of Hotfix Rollup 1 for Microsoft Forefront Protection for Exchange

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