Recently I have seen this issue when trying to create an Enterprise Portal site with SharePoint 2010. The setup failed when creating an EP site via the AX setup and when creating a new site collection via SharePoint central admin onto a newly created web application. The important part of the setup log was:
Entering function CurrentUserAliasLeaving function CurrentUserAliasCreating new Enterprise Portal Site with following the parameters:\n URL: http://axserv/sites/DynamicsAx\n Title: EP Site\n LCID: 1033\n OwnerLogin: CONTOSO\axadminAdministration Web Service URL: http://axserv:1255/_layouts/ep/WSSAdmin.asmxInformation: Debugging mode is off.An error occured while Setup was creating a new site.Client found response content type of 'text/html; charset=utf-8', but expected 'text/xml'.The request failed with the error message:
Within the setup log, after the section copied above, there was some HTML code, we copied this out into notepad and saved as html to get a better look at it, what it showed was:
Error An unexpected error has occurred. Troubleshoot issues with Microsoft SharePoint Foundation. Correlation ID: 43d5fd87-a6b3-472b-92bc-de3c5b16066f Date and Time: 7/22/2011 5:24:06 PM Go back to site
We're using the standard WSS admin web service to create the EP site, we just call the web service and send out XML that creates all our pages and Web Parts etc.In this case it appears that it failed in the first call to the web service.
Solution: The EP site creation failed because the correct permissions were not setup within Central Admin so therefore the Web Service could not be called. The solution was to add the Business Connector Service account to the Central Admin Farm Administrators Group, then the EP site could be created without throwing any errors.