Changed Certificate on SBS 2008, IIS now broken.

I have generated a self signed SAN certificate on SBS 2008.

Now I cant access IIS propperly.

This is what I did:-

Now I get 403.4 and site missing completely, and the default web site unable to start.



[PS] C:\Windows\System32>New-ExchangeCertificate -GenerateRequest -SubjectName "
C=GB, o=shortdomain Ltd., CN=remote.shortdomain.co.uk" -DomainName

remote.shortdomain.co.uk, autodiscover.longdomain.co.uk, exchange-svr, exchange-svr
.shortdomain.local, remote.longdomain.co.uk -FriendlyName "Exchange Hosting
 SAN" -KeySize 1024 -Path c:\san201105171150.txt -PrivateKeyExportable:$true

Thumbprint                                Services   Subject
----------                                --------   -------
*************************************A0B  .....      C=GB, O=shortdomain ...


[PS] C:\Windows\System32>certreq -submit -attrib "CertificateTemplate:WebServer"
 c:\san201105171150.csr
RequestId: 7
Certificate retrieved(Issued) Issued

[PS] C:\Windows\System32>Import-ExchangeCertificate -Path c:\san201105171150.p7b


Thumbprint                                Services   Subject
----------                                --------   -------
*************************************BFE  .....      CN=remote.shortdomain.co.u...


[PS] C:\Windows\System32>Enable-ExchangeCertificate -Thumbprint

*************************************BFE -Services IIS, POP, IMAP ,SMTP

Confirm
Overwrite existing default SMTP certificate,
'*************************************4AD' (expires 5/9/2013 11:30:55 AM), with
 certificate '*************************************BFE' (expires 5/16/2013
10:56:17 AM)?
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help
(default is "Y"):
[PS] C:\Windows\System32>


Any ideas what this may have messed up in IIS?