What happens if you attempt to validate a ticket manually? For example, if you choose dummy values for service and ticket and open a browser to the service ticket validation URL, e.g. https://localhost:8443/cas-server-webapp-3.3.5/serviceValidate?service=https://example.com&ticket=ST-127-a456DF6efsqQ85SD8QDfs4-localhost, do you get the expected validation failure XML response? If so, the problem is clearly CAS client misconfiguration in which case you should examine the requests the client is making using a Web proxy such as WebScarab and confirm it is sending requests to the correct URLs on the CAS server. I'm fairly certain you're getting an HTML 404 (or similar) error page when you attempt to validate your ticket, which would explain the parser DTD fetch errors -- you're getting 404 HTML instead of the expected XML response.
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