how do I fix the following problem. I am not ablet to to connect to some remote service.
Update: Could not open update site #270 "", URL: http://update.joomlart.com/service/tracking/j16/mod_ja_acm.xml
Update: Could not open update site #272 "", URL: http://update.joomlart.com/service/tracking/j16/plg_system_t3.xml
Update: Could not open update site #280 "", URL: http://update.joomlart.com/service/tracking/j16/uber.xml
Update: Could not open update site #281 "JA Extension Manager", URL: http://update.joomlart.com/service/tracking/j16/com_jaextmanager.xml
Before updating ensure that the update is compatible with your Joomla! installation.
You are strongly advised to make a backup of your site's files and database before you start updating.