If you can connect to the Raspberry Pi via Putty, then Couch DB might be inactive. For starting CouchDB. you should log in via Putty to your Raspberry Pi and execute the command
sudo -i -u couchdb /home/couchdb/bin/couchdb
Hopefully that helps.. If not, please check if you have also have changed the chttp – bind_address parameter to 0.0.0.0 as described above.