network access from iseries question

we have an environment where our iseries talks with our windows server. The users that log into both the network and iseries have the same user/passwords (not a single signon environment). If the passwords are unmatched, the iseries would throw a CPDB053 Error exchanging security information.

Other then single-signon approach (not ready for that yet), is there a way to set up iseries to windows server authority using a group profile rather then the specific user? So if john/bill/mary and tom where logged in and the iseries needed to access the windows server (/qntc/10.0.0.2/windows_folder) it would authenticate with WINDGRP profile where WINDGRP has authority to that location?