I was looking in my log when i've found this:

10:34:36,513 INFO  [WebContainer : 13][PluginPackageUtil:1308] Reloading repositories
10:34:37,046 ERROR [WebContainer : 13][PluginPackageUtil:1326] Unable to load repository http://plugins.liferay.com/official com.liferay.portal.plugin.PluginPackageException: Unable to download file http://plugins.liferay.com/official/liferay-plugin-repository.xml because of response code 404
10:34:37,409 ERROR [WebContainer : 13][PluginPackageUtil:1326] Unable to load repository http://plugins.liferay.com/community com.liferay.portal.plugin.PluginPackageException: Unable to download file http://plugins.liferay.com/community/liferay-plugin-repository.xml because of response code 404
10:34:37,772 ERROR [WebContainer : 13][PluginPackageUtil:339] Unable to download file http://plugins.liferay.com/official/liferay-plugin-repository.xml because of response code 404
10:34:38,137 ERROR [WebContainer : 13][PluginPackageUtil:339] Unable to download file http://plugins.liferay.com/community/liferay-plugin-repository.xml because of response code 404

Is this a problem?

I have to update the repository url?

Liferay version 6.1.3

Tanks in advice,

Manuel