Forum OpenACS Q&A: Response to nsvhr /nssock/nsunix config
Maybe we can help you if you post the ns/server/master/module/nsvhr/maps section of the master's config file and the relevant section of the client's config - either ns/server/slave/module/nsunix or ns/server/slave/module/nssock, depending on the method you chose.
Also make sure to take a look in the master's server log, not only in the client's. Any errors in virtual hosting redirection - e.g. a failed connection attempt to a unix socket - should be logged there.