1.please check wheteher you have set the EXTERNAL_WEB_PORT parameter on the PPM Server if you are using an external web server.
2. Also please check you have specified workers.properties correctly.
The connection between the PPM server and the webserver is some where missing(thats why you are getting the error 'Web services are not enabled for this server. Please contact your administrator' ) so i suggest you to check the port features!
We have crossed checked those.. those seems to be correct. But interesting thing is when we view this parameter from front end admin console, the setting is showing as false where as through server it is showing as true.
Why it is behaving like this.. where is the problem..