Can't connect to local or remote Couchbase server

I've written a test application that just connects to a Couchbase server, and reads one record. I've tested this app on other machines and it works, however I can't connect to any Couchbase server (local or remote) from my local machine. Every time, I get a System.Net.WebException when it times out.

Firewall is turned off
There are no HTTP debugging applications running
I can connect to the server via a web browser
Using a CouchbaseCluster connection works

Attached is my solution, and the log is in the /bin/debug folder.