There is a problem with the proxy server's security certificate. The name on the security certificate is invalid or does not match the name of the target site "Mailserver"

Good day Guys
First of all I am not an Exchange Expert, and I might be asking a very stupid question, but please bare with me. :) 
While I was on leave our Mail server fell over and The company got a Specialist to help out for the time being.
We where\are on Microsoft Exchange 2007 , which Fell over, and the specialist was able to recover as much data as he could.
They then installed Exchange 2013 and tried to migrate everything from 2007 to 2013 and not everything migrated over.
But the problem is, Outlook Anywhere was enable on 2007 and worked a 100% (before the disaster)
With Exchange 2013 I get the following error message when trying to connect With Outlook 2013, using an external connection:
"There is a problem with the proxy server's security certificate. The name on the security certificate is invalid or does not match the name of the target site "Mailserver"
Outlook is unable to connect to the Proxy server. (Error Code 0)"
Has anyone had the Similar when migrating over from 2007 to 2013 or is this an Issue on IIS and nothing to do with Exchange migration?
Your assistance will be greatly appreciated.

Hi,
Firstly, I would suggest we use Exchange 2013 FE as the Outlook Anywhere proxy server.
For the certificate issue, it mostly occurs because the host name that Outlook are trying to access does not match the certificate SAN. Please check with this point. If they do not match, you
can change the host name by referring to the following article:
https://support.microsoft.com/kb/940726/en-us?wa=wsignin1.0
Thanks,
Simon Wu
TechNet Community Support

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