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Although you configured specific properties in your HTTP send port in Microsoft BizTalk Server 2004, the properties are not used and the default properties from the HTTP Adapter settings are used instead. When you configure a proxy port for any port other than 80, the HTTP transport may still use port 80 for its proxy port.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft BizTalk Server 2004. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
888751 How to obtain the latest BizTalk Server 2004 service pack
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.