If your Feed is timing out, you may find that this is due to an issue with the responsiveness of the server in general. This means that regardless of whether you are accessing the feed through dlvr.it or through the open web, the feed does not respond.
The other possibility is that the dlvr.it servers are blacklisted. The best way to diagnose this is to attempt to open the Feed within a general web browser. If the feed responds quickly, the likelihood is that dlvr.it servers are not allowed to request content from the feed's servers. If the feed responds slowly, it is likely that the servers hosting the feed are taking too long to load or generate the information.