OUTLOOK收到http重定向到HTTPS的警告通知
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你好，
这个是当自动发现服务查询可用的DNS时，在可用的DNS中包含有http开头的记录，自动发现服务会尝试连接到该DNS记录导致；
建议你参考下面的这篇博客，里面有介绍到这种情况：
Exchange & The Autodiscover Web Service
For external Outlook clients in Starbucks, they are not able to directly contact AD (I sure hope that you don’t have a DC exposing 389 TCP to the Internet…..) and thus will use DNS to locate the Autodiscover endpoint.
A new feature is available that enables Outlook 2007 to use DNS Service Location (SRV) records to locate the Exchange Autodiscover service
http://support.microsoft.com/?kbid=940881
Prior to this update Outlook would perform these DNS queries by default:
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https://<<var>smtpdomain</var>>/Autodiscover/Autodiscover.xml
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https://autodiscover.<<var>smtpdomain</var>>/Autodiscover/Autodiscover.xml
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http://autodiscover.<<var>smtpdomain</var>>/Autodiscover/Autodiscover.xml
With this update installed the SRV query is added:
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https://<<var>smtpdomain</var>>/Autodiscover/Autodiscover.xml
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https://autodiscover.<<var>smtpdomain</var>>/Autodiscover/Autodiscover.xml
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http://autodiscover.<<var>smtpdomain</var>>/Autodiscover/Autodiscover.xml
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SRV record query for _autodiscover._tcp.<smtpdomain>
As an example:
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Autodiscover posts to https://contoso.com/Autodiscover/Autodiscover.xml. This fails.
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Autodiscover posts to https://autodiscover.contoso.com/Autodiscover/Autodiscover.xml. This fails.
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Autodiscover performs the following redirect check:
GET http://autodiscover.contoso.com/Autodiscover/Autodiscover.xml
This fails.
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Autodiscover uses DNS SRV lookup for _autodiscover._tcp.contoso.com, and then "mail.contoso.com" is returned.
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Outlook asks permission from the user to continue with Autodiscover to post to https://mail.contoso.com/autodiscover/autodiscover.xml.
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Autodiscover's POST request is successfully posted to https://mail.contoso.com/autodiscover/autodiscover.xml.
Note: If you Internet facing DNS provider does not support SRV records then you cannot use this feature
谢谢！
Niko Cheng
TechNet Community Support
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