Below is my error.

I have bought a certificate and installed.

The certificate  Onderwerp extern certificaat: CN=OpenWrt, L=Leipzig, S=Saxony, C=DE, Verlener: CN=OpenWrt, L=Leipzig, S=Saxony, C=DE. is not that .

Outlook-connectiviteit testen.
	Testen van de Outlook-connectiviteit is mislukt.
	Bijkomende details   Verstreken tijd: 2244 ms.
	Teststappen   Testen van RPC via HTTP-connectiviteit met server mail.andries-ds.be   RPC via HTTP-connectiviteit is mislukt.   Bijkomende details   Verstreken tijd: 2244 ms.   Teststappen   Poging tot het omzetten van de hostnaam mail.andries-ds.be in DNS.   De hostnaam werd met succes opgelost.   Bijkomende details   Geretourneerde IP-adressen: 81.82.240.130 Verstreken tijd: 419 ms. Testen TCP-poort 443 op host mail.andries-ds.be om de garanderen dat deze reageert en beschikbaar is.   De poort werd met succes geopend.   Bijkomende details   Verstreken tijd: 362 ms. Testen van het SSL-certificaat om te garanderen dat het geldig is.   Het SSL-certificaat slaagde niet voor een of meerdere geldigheidscontroles.   Bijkomende details   Verstreken tijd: 1462 ms.   Teststappen   De Microsoft Connectivity Analyzer probeert het SSL-certificaat te verkrijgen van externe server mail.andries-ds.be op poort 443.   De Microsoft Connectivity Analyzer heeft het externe SSL-certificaat verkregen.   Bijkomende details   Onderwerp extern certificaat: CN=OpenWrt, L=Leipzig, S=Saxony, C=DE, Verlener: CN=OpenWrt, L=Leipzig, S=Saxony, C=DE. Verstreken tijd: 1426 ms. Bezig met valideren van de certificaatnaam.   Verificatie certificaatnaam mislukt.    <label for="testSelectWizard_ctl12_ctl06_ctl00_ctl02_ctl01_tmmArrow">Ik wil meer weten over dit probleem en de mogelijke oplossing ervan</label>   Bijkomende details   Hostnaam mail.andries-ds.be komt met geen enkele naam gevonden op servercertificaat CN=OpenWrt, L=Leipzig, S=Saxony, C=DE overeen. Verstreken tijd: 0 ms.

It  your certificate is not installed. It is using the self signed certificate.

Follow this procedure

mail.andries-ds.be uses an invalid security certificate. The certificate is not trusted because it is self-signed. The certificate is only valid for OpenWrt (Error code: sec_error_unknown_issuer)

Hi sidcopa,

According to your description, I understand that test Remote connectivity Analyzer failed with error SSL Certificate Name Mismatch after buy and installed a new certificate.
If I misunderstand your concern, please do not hesitate to let me know.

Please run following command to double check the SAN of Exchange certificate:
Get-ExchangeCertificate | FL Identity,Subject,Status,RootCAType

Then run following command to get the useful name for web access:
Get- ClientAccessServer | FL Identity,*URI*
Get-WebServicesVirtualDirectory | FL Identity,*URL*
Get-OABVirtualDirectory | FL Identity,*URL*
Get-UMVirtualDirectory | FL Identity,*URL*
Get-OutlookAnywhere | FL Identity,*host*
Get-OwaVirtualAnywhere | FL Identity,*URL*

If there are some items mismatch, please try to modify then try again.
More details about Digital certificates and SSL, please refer to:
https://technet.microsoft.com/en-us/library/dd351044(v=exchg.150).aspx

Best Regards,
Allen Wang

The first command looks OK to me

[PS] C:\Windows\system32>
[PS] C:\Windows\system32>Get-ExchangeCertificate | FL Identity,Subject,Status,RootCAType

Subject    : CN=mail.andries-ds.be, OU=PositiveSSL, OU=Domain Control Validated
Status     : Valid
RootCAType : ThirdParty

Subject    : C=BE, S=Oost-Vlaanderen, L=Ertvelde, O=Andries De Scheemaeker bvba, OU=Werkplaats, CN=mail.andries-ds.be
Status     : PendingRequest
RootCAType : Unknown

Subject    : CN=remote.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=remote.mail.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=remote.mail.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=remote.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=remote.remote.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=remote.mail.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=DCANDRIES001.andries-ds.local
Status     : Valid
RootCAType : Registry

Subject    : CN=remote.andries-ds.be
Status     : Valid
RootCAType : Registry

Subject    : CN=Sites
Status     : Valid
RootCAType : Registry

Subject    : CN=andries-ds-DCANDRIES001-CA
Status     : Valid
RootCAType : Registry

Subject    : CN=WMSvc-WIN-QOIUIPRCRQO
Status     : Valid
RootCAType : Registry

The second looks also OK

[PS] C:\Windows\system32>Get-ClientAccessServer | FL Identity,*URL*

Identity : DCANDRIES001

The third also OK ??? I see no mail.andries-ds.be in it

[PS] C:\Windows\system32>Get-WebServicesVirtualDirectory | FL Identity,*URL*

Identity             : DCANDRIES001\EWS (Default Web Site)
InternalNLBBypassUrl : https://dcandries001.andries-ds.local/ews/exchange.asmx
InternalUrl          : https://remote.andries-ds.be/EWS/Exchange.asmx
ExternalUrl          : https://remote.andries-ds.be/EWS/Exchange.asmx

The fourth command looks OK

[PS] C:\Windows\system32>Get-OABVirtualDirectory | FL Identity,*URL*

Identity    : DCANDRIES001\OAB (Default Web Site)
InternalUrl : https://remote.andries-ds.be/OAB
ExternalUrl : https://mail.andries-ds.be/OAB

The fift command give an error

[PS] C:\Windows\system32>Get-UMVirtualDirectory | FL Identity,*URL*
The term 'Get-UMVirtualDirectory' is not recognized as the name of a cmdlet, function, script file, or operable program
. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:23
+ Get-UMVirtualDirectory <<<<  | FL Identity,*URL*
    + CategoryInfo          : ObjectNotFound: (Get-UMVirtualDirectory:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

The 6 command
[PS] C:\Windows\system32>Get-OutlookAnywhere | FL Identity,*URL*

Identity : DCANDRIES001\Rpc (Default Web Site)
XropUrl  :