We had a CiviCRM installation where the dashlets worked fine...until...we configured Apache to forward all requests over 443 (https).
It seems that now an AJAX callback is failing (going directly to the callback leads to a "Sorry but we are not able to provide this at the moment." error. The error details with debugging turned on state:
$Fatal Error Details = Array ( [callback] => Array (  => CRM_Core_Error  => handle ) [code] => 0 [message] => [mode] => 16 [debug_info] => [type] => PEAR_Error [user_info] => [to_string] => [pear_error: message="" code=0 mode=callback callback=CRM_Core_Error::handle prefix="" info=""] )
Which is not terribly helpful for us who are not very familiar with the CiviCRM core. Any ideas why this issue is occurring and/or what the fix might be?