Bug validating page

http://validator.w3.org/unicorn/check?ucn_uri=www.royin.go.th%2Fth%2Fhome%2Findex.php%3FSystem_Session_Language%3DThai&ucn_task=conformance#class java.io.IOException


Server returned HTTP response code: 504 for URL: http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fwww.royin.go.th%2Fth%2Fhome%2Findex.php%3FSystem_Session_Language%3DThai&output=ucn
sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1491)
java.security.AccessController.doPrivileged(Native Method)
sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1485)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)
org.w3c.unicorn.request.URIRequest.doRequest(URIRequest.java:141)
org.w3c.unicorn.RequestThread.run(RequestThread.java:66)

Note: http://validator.w3.org/ works fine with this link (and find hundreds of errors).

Kind regards,

Gerriet.