Have set up Flickr according to this page http://doc.silverstripe.org/doku.php?id=flickrservice&s=flickr%20service. Ran into the following error locally when no internet connection available (i.e. Flickr website/photos can not be reached).
[Warning] Curl Error:couldn't connect to host
Line 129 in (...)sapphire/api/RestfulService.php
(...)
128 if($curlError) {
129 user_error("Curl Error:" . $curlError, E_USER_WARNING);
130 return;
131 }