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Certificate warning in Outlook

Hi

We have On-premises Exchange 2007/Domain controller installed and Outlook Anywhere is "Disabled"

For some testing, When I try to configure Exchange online account in our office, it is giving error attached.

I understand that it is about AUtodiscover or Outlook anywhere issue of on-premise exchange server.

But in my case, I'm trying to setup "Exchange Online" ,not my premises exchange.

After further test, I notice it is actually giving warning for other domains (my friend's server)as well for autodiscovery which is working

Any suggestion what could be causing this ?
cert-error.png
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bominthu
Asked:
bominthu
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2 Solutions
 
Simon Butler (Sembee)ConsultantCommented:
If you are using the same domain for Office365 then you will have problems.
The client will query your internal Domain for Autodiscover information first, before trying to access the internet.

Autodiscover will also attempt to connect to https://example.com/Autodiscover/Autodiscover.xml.
Most web hosts will have an SSL site on the root of the web server, which will generate the error.

You need to get DNS sorted out. If the web host has Autodiscover enabled they need to turn that off.

Simon.
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Satya PathakLead Technical ConsultantCommented:
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bominthuAuthor Commented:
Both of your comments were helpful.

Thanks
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bominthuAuthor Commented:
By the way I have a quick question. Sorry, not related to this issue.

When we configure Disclaimer for all incoming and outgoing email, I know we can use  transport rule to set.
In my Client server, the rule is not there but there is always a signature for "all outgoing email".
From where that Disclaimer could be coming ? Is there another place other than using transport rule ?

Thanks
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Simon Butler (Sembee)ConsultantCommented:
As the question is unrelated, you should ask it fresh.

Simon.
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