Win 2008 SSTP server -cert renewal.

hello, 

I do have win 2008 based SSTP server,

I do want to renew a cert but getting error "parameter not correct", 6th point:

http://blogs.technet.com/b/rrasblog/archive/2007/10/04/how-to-change-the-machine-certificate-of-sstp-based-rras-server.aspx

My new cert have 2 difference to old one.

1. new certificate dont have SAN value (because I dont want end users to be able to connect with servers internal FQDN)

"Servername.domain.com"

Servername.internaldomain.domain.com - removed from SAN.

Do I need to re-configure SSTP setting some where?

2. Also new certificate is SHA2, old one is SHA1.

Thanks in Advance