Your URLs aren't configured correctly.
It is attempting to connect to external IP addresses rather than internal.
That usually means that you have setup the internal URLs on the virtual directories wrong.
That isn't something that Exchange does on its own, so someone has changed the configuration.
You can't have any Outlook 2007 clients, because if you did, with the URLs set incorrectly Outlook wouldn't be working.
You need to correct that. You also need to have a SAN/UC certificate on the server that matches the host name you are using internally.
Simon.