Cert update in TN for Enterprise not taking

I have got new certs for our Trading Networks Enterprise and have installed all 3 (the 2 CA’s and the primary cert) and within TN they look fine, but it’s not reflecting in reality. I have restarted WM and even rebooted the entire server to no avail.
The current cert expires at midnight so I’m sure tomorrow will be great fun for me. Can anyone offer a suggestion?
WebMethods integration Server 6.5 on a Windows 2003 box