I am trying to run the Secure Conversation example in WSE 2.0.
On the call to client.IssueSecurityContextTokenAuthenticated(token,
issuerToken);
I get the following exception:

System.Web.Services.Protocols.SoapException:
SOAP-Fault code: http://schemas.xmlsoap.org/soap/envelope/:Server
Message: Server unavailable, please try later
  at
Microsoft.Web.Services2.Messaging.SoapClient.SendRequestResponse(String
methodname, SoapEnvelope envelope)
  at
Microsoft.Web.Services2.Security.SecurityTokenServiceClient.RequestSecurityToken(SecurityTokenMessage
request, String methodName)   at
Microsoft.Web.Services2.Security.SecurityContextTokenServiceClient.RequestSecurityContextToken(SecurityToken
baseToken, SecurityToken issuerToken, AppliesTo appliesTo)
  at
Microsoft.Web.Services2.Security.SecurityContextTokenServiceClient.IssueSecurityContextTokenAuthenticated(SecurityToken
baseToken, SecurityToken issuerToken)
  at SecureConvClient.SecureConvClient.Run() in
d:\work\tests1\securitytestswse\secureconvcodeclient\secureconvclient.cs:line
91
  at SecureConvClient.SecureConvClient.Main(String[] args) in
d:\work\tests1\securitytestswse\secureconvcodeclient\secureconvclient.cs:line
55

This is all being run locally on a Server 2003 machine with IIS 6.0. I
believe that I have installed the certificates correctly (emphasis on
believe...).
The client private cert is in Current User/Personal.
The server private cert is in Local Computer/Personal.
The server public cert in in Current User/Other People

Any ideas where this is coming from?

Thanks.

David