Index: wp-admin/upgrade-schema.php
===================================================================
--- wp-admin/upgrade-schema.php	(revision 3925)
+++ wp-admin/upgrade-schema.php	(working copy)
@@ -232,6 +232,7 @@
 	add_option('blog_public', '1');
 	add_option('default_link_category', 2);
 	add_option('show_on_front', 'posts');
+	add_option('open_proxy_check_url', 'sbl-xbl.spamhaus.org');
 
 	// Delete unused options
 	$unusedoptions = array ('blodotgsping_url', 'bodyterminator', 'emailtestonly', 'phoneemail_separator', 'smilies_directory', 'subjectprefix', 'use_bbcode', 'use_blodotgsping', 'use_phoneemail', 'use_quicktags', 'use_weblogsping', 'weblogs_cache_file', 'use_preview', 'use_htmltrans', 'smilies_directory', 'fileupload_allowedusers', 'use_phoneemail', 'default_post_status', 'default_post_category', 'archive_mode', 'time_difference', 'links_minadminlevel', 'links_use_adminlevels', 'links_rating_type', 'links_rating_char', 'links_rating_ignore_zero', 'links_rating_single_image', 'links_rating_image0', 'links_rating_image1', 'links_rating_image2', 'links_rating_image3', 'links_rating_image4', 'links_rating_image5', 'links_rating_image6', 'links_rating_image7', 'links_rating_image8', 'links_rating_image9', 'weblogs_cacheminutes', 'comment_allowed_tags', 'search_engine_friendly_urls', 'default_geourl_lat', 'default_geourl_lon', 'use_default_geourl', 'weblogs_xml_url', 'new_users_can_blog');
Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 3925)
+++ wp-includes/functions.php	(working copy)
@@ -1011,9 +1011,9 @@
 }
 
 function wp_proxy_check($ipnum) {
-	if ( get_option('open_proxy_check') && isset($ipnum) ) {
+	if ( get_option('open_proxy_check') && get_option('open_proxy_check_url') != '' && isset($ipnum) ) {
 		$rev_ip = implode( '.', array_reverse( explode( '.', $ipnum ) ) );
-		$lookup = $rev_ip . '.opm.blitzed.org.';
+		$lookup = $rev_ip . '.' . get_option('open_proxy_check_url') . '.';
 		if ( $lookup != gethostbyname( $lookup ) )
 			return true;
 	}