SSL Certificate Security Alert

Main office running SBS2011
I setup 3 new Windows 7 Prof. 64 bit machines and install Office Prof. 2013

Setup Outlook 2013 to use our Exchange server 2010 which runs on our Small Business server 2011.
I then moved these computers to our second office out of town
The second office and our main office is connected with VPN router to router
the router on the second office points to the main office for DNS this way my users can use mapped drives on the server in the main office.

It's been running fine for a couple months but now the three computers at the second office keeps getting the SSL security alert when they open up Outlook 2013
I tried to resolve at the user end by selecting "View Certificate.

Any suggestions are appriocated
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jsarinanaI.T. ManagerAsked:
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mmichaCommented:
Can you be more descriptive in terms of the error or warning you are receiving from those stations?
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jsarinanaI.T. ManagerAuthor Commented:
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jsarinanaI.T. ManagerAuthor Commented:
mmicha
I uploaded a pic of the SSL security screen we are getting
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mmichaCommented:
What happens when you do a traceroute from the second site to autodiscover.ksninc.com?

If you have a VPN between sites you may be using the internal name for the Exchange Server and not the external name which would cause the certificate warning.  I'm not sure if your internal domain is ksninc.com or something ending in like .local / .internal.
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jsarinanaI.T. ManagerAuthor Commented:
Outlook us using server name.domain.ksninc.pvt

If I ping ksninc.com it gives me the internal
Address 192.168.1.26
The main off is in 192.168.1.0
Second office is 192.168.4.0
And the firewall in the second offices calls out 192.168.1.26 for DNS
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mmichaCommented:
I believe because internally you are connecting to the *.pvt domain for the mail server and it isn't on the certificate is creating the problem.  

I'd be curious if you added in your hosts file on one of those remote pc's if you'd still get the error:

autodiscover.ksninc.com  192.168.1.x (your exchange server address)
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jsarinanaI.T. ManagerAuthor Commented:
so edit the local host file and add
autodiscover.ksninc.com 192.168.1.26  .26 is the Exchange server

correct?
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mmichaCommented:
Yes.  I'm curious if you get the warning when that is in place.
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jsarinanaI.T. ManagerAuthor Commented:
Does this look correct?

# localhost name resolution is handled within DNS itself.
#      127.0.0.1       localhost
#      ::1             localhost
      192.168.1.26 ksninc.com
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mmichaCommented:
It should be:

192.168.1.26 autodiscover.ksninc.com
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jsarinanaI.T. ManagerAuthor Commented:
I added
192.168.1.26 autodiscover.ksninc.com and it seems to be ok now
Thanks I'll give it a day to make sure
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jsarinanaI.T. ManagerAuthor Commented:
Autodiscover worked
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