Index: wp-admin/network/upgrade.php
===================================================================
--- wp-admin/network/upgrade.php	(revision 19108)
+++ wp-admin/network/upgrade.php	(working copy)
@@ -52,17 +52,18 @@
 			echo '<p>' . __( 'All done!' ) . '</p>';
 			break;
 		}
-		echo "<ul>";
+		echo '<ul>';
 		foreach ( (array) $blogs as $details ) {
 			$siteurl = get_blog_option( $details['blog_id'], 'siteurl' );
-			echo "<li>$siteurl</li>";
-			$response = wp_remote_get( trailingslashit( $siteurl ) . "wp-admin/upgrade.php?step=upgrade_db", array( 'timeout' => 120, 'httpversion' => '1.1' ) );
+			echo '<li>' . $siteurl;
+			$response = wp_remote_get( get_admin_url( $details['blog_id'], 'upgrade.php?step=upgrade_db' ), array( 'timeout' => 120, 'httpversion' => '1.1' ) );
 			if ( is_wp_error( $response ) )
-				wp_die( sprintf( __( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: <em>%2$s</em>' ), $siteurl, $response->get_error_message() ) );
+				echo '<p>' . sprintf( __( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: <em>%2$s</em>' ), $siteurl, $response->get_error_message() ) . '</p>';
+			echo '</li>';
 			do_action( 'after_mu_upgrade', $response );
 			do_action( 'wpmu_upgrade_site', $details[ 'blog_id' ] );
 		}
-		echo "</ul>";
+		echo '</ul>';
 		?><p><?php _e( 'If your browser doesn&#8217;t start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&amp;n=<?php echo ($n + 5) ?>"><?php _e("Next Sites"); ?></a></p>
 		<script type='text/javascript'>
 		<!--