Try using URL without index.php as index

dumpgenerator.py

@@ -1274,6 +1274,13 @@ def getParameters(params=[]):
         index = index2
         if index and index.startswith('//'):
             index = args.wiki.split('//')[0] + index
+        if index and checkIndex(
+                index=index,
+                cookies=args.cookies,
+                session=session):
+            print 'index.php is OK'
+        else:
+            index = '/'.join(index.split('/')[:-1])
             if index and checkIndex(
                     index=index,
                     cookies=args.cookies,
@@ -1394,6 +1401,11 @@ def checkIndex(index=None, cookies=None, session=None):
             raw) and not cookies:
         print "ERROR: This wiki requires login and we are not authenticated"
         return False
+    if re.search(
+            r'(page-Index_php|"wgPageName":"Index.php"|"firstHeading"><span dir="auto">Index.php</span>)',
+            raw):
+        print "Looks like the page called Index.php, not index.php itself"
+        return False
     if re.search(
             r'(This wiki is powered by|<h2 id="mw-version-license">|meta name="generator" content="MediaWiki)',
             raw):