postgresql 9.1 Multiple Cluster on same host
First, please post error messages.  Otherwise this is shooting in the dark.

You could have a bunch of problems.  I would suggest the following:


If you simply get a connection refused, try netstat -p | grep 5433 so you can see what programs are listening on the port.  Is it something unexpected?
If you are getting pg_hba.conf errors, double check your settings there.
Please check again your listen settings in your postgresql.conf file.
Check your postgresql log on the cluster you are having trouble with.  Please post relevant sections if this doesn't get you to your answer.