@rameshnittali so are you getting this timeout message from your PHP application or the android one? Just to be clear, I guess you are connecting the android one through the sync gateway to couchbase, then use shadow buckets and access from PHP using the shadowed bucket?
Can you share more logs around that timeout? Also make sure to have all needed ports open (from the server side, 11210, 8091, 8092 and if 4.0 beta also 8093)