Must supply a DBC file name

After re-applying TXK Rollup S for an issue with TNS described in a previous post, JSP ping test launched through System Administration responsibility failed with this message:

http://jupiter.justanexample.com/OA_HTML/jsp/fnd/fndping.jsp

Must supply a DBC file name.

$FND_SECURE pointed to $FND_TOP/secure. We had $CONTEXT_NAME.dbc, $TWO_TASK.dbc files in it. The aoljtest also has JSP ping. But those JSP ping gave the result "Test is no longer available".

If I create the URL manually and add the dbc clause:

http://jupiter.justanexample.com/OA_HTML/jsp/fnd/fndping.jsp?dbc=$CONTEXT_NAME.dbc

So now the question is, why is it not creating the URL correctly.