I am going thru and starting a migration from on premises Exchange 2007 to Cloud based Office 365. I have done a check on the Microsoft Remote Connectivity Analyzer and it is coming back with an error of:
It says attempting to resolve host name was successful. Testing port 443 was successful.
Testing the SSL certificate to make sure it's valid.
The SSL certificate failed one or more certificate validation checks.
When I use Outlook on my laptop outside my business network it connects up to my exchange and downloads and sends emails no problems.
I have a Go Daddy certificate installed on my server for the domain.com.au.
Any ideas on where I can start with this?