Message processing failed. Cause: com.sap.engine.interfaces.messaging.api.exception.MessagingException: Target directory '*' does not exist and cannot be created

Hi experts,

I am doing Proxy to File(NFS) scenario in sap pi 7.1 .   directory  needs user/pass when I connect from PI server .  How I can reach to this location in entegration without using user/pword.  Which user in PI need to have authorization??