Grouper : Error : Failed to open internet connection

Grouper - Documentation

Internet connection failed

Explanation

Grouper was unable to open an internet connection to download the requested feed. NOTE: The message that is displayed is what PHP reported to Grouper. Sometimes "Success (0)" will be displayed when in fact a connection error has occurred.

Causes and Solutions

There are many possible reasons why your server might not be able to connect to some other server. The cause of the problem may be indicated (or at least alluded to obliquely) in the error message. A few possibilities:

The name of the other server is misspelled: Check the URL of the feed to make sure you've spelled it correctly.
Your web host has a firewall blocking outgoing connections: If so, you'll need to contact them and request that Grouper be allowed to make outgoing connections on port 80 (they'll know what that means).
DNS isn't working properly on your server: If that's the case, your web host will need to fix it.
Grouper needs to go through a proxy server, but you haven't configured it to do so.
Grouper is configured to go through a proxy server, but the proxy server requires authentication credentials and you haven't supplied them.
Your web host disabled the PHP function "fsockopen": Try running the installation script (groupersetup.php) again. Don't delete Grouper first--just make sure you have groupersetup.php and groupersetupinc.php uploaded and try starting it up. If it doesn't tell you that fsockopen is disabled when it checks PHP function support, then that's not the problem.
etc.

How can I turn error reporting off?
How can I stop error messages from linking to this page?