OpenSSL and OCS and Windows 2003 CA

I am trying to enable TLS connectivity between my application which
uses a 3rd party app which requires OpenSSL to Office Communicator
Server (OCS).

I suppose the applications on the platforms do not matter at this
stage- I have a CA on my Domain Controller and the OCS server uses
this when it applies its certificates when being configured.

So on my application/platform I issued a certificate from the same CA
(tried exporting, creating,etc,etc all methods) , converted the PFX to
PEM format for OpenSSL using the "openssl pkcs12 -in X:\dir\certA.pfx -
out X:\dir\certA.pem -nodes" to do this.

I apply this certificate to the machine with my application, it is
read in and loaded and added to the trusted CA via the 3rd party API's
fine.

When I try and enable TLS I get handshaking (Server/Client Hello sent)
but it then suddenly terminates. The error I am getting is on my
applications server and not the OCS machine. The logs (Wireshark /OCS
logger) tell me
"The peer certificate does not contain a matching FQDN"

I have tried all I know in creating these certificates but no joy same
error every time.
I have tried:
Exporting the actual certificate from OCS
A new certificate from the same CA
Reused the same certificate

Is the conversion incorrect perhaps, any ideas/suggestions would be
gratefully appreciated

Regards

.

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