Cannot use autodiscover or rpc over http

System specs:

Windows server 2003 sp2
Exchange server 2007 sp1
certificate has all the correct A records autodiscover, mail etc

I have an issue with my exchange server without having made any changes to the server. I cannot setup new outlook accounts in outlook 2007. All the current outlook accounts seem to be working fine though.

www.testexchangeconnectivity.com results are below:

attempting to test potential autodiscover URL https://domain.co.uk/autodiscover/autodiscover.xml

failed

additonal details

hostname doesn't match any name found on the certificate CN=mail.domain.co.uk, O=CO NAME, L=town, S=county, C=GB

Attempting to test potential autodiscover URL https://autodiscover.domain.co.uk/autodiscover/autodiscover.xml failed

A web exception occurred beacause an HTTP 401 - unauthorized response was received from unknown.

I can telnet into the exchaneg server on ports 443, 80, 6001, 6002 and 6004 ok

rpccfg /hd results in the correct ports being shown

When i try:

C:\Documents and Settings\account>rpcping -t ncacn_http -s i3-mx-01 -o RpcPro
xy=mail.domain.co.uk -P "account,domain.local,*" -I "account,domain.local,*" -
H 2 -u 10 -a connect -F 3 -v 3 -E -R none

I get - client is not authorised to ping rpc proxy but when I change the H value to 1 reponse received from server and pinged successfully.

Can anyone point me in the right direction? I feel that I have nearly resolved this issue but am still not there.

Thanks,

Andrew