no volumes showing up

I have afp running on Linux 10sp2 with OES2sp1. MAC user can log in
through mac workstation but no volumes showing up. I did make sure that
MAC user has the access rights to the MAC volume. I had one of MAC users
to log in Windows and can access MAC volume with no problem.

I checked the afptcpd log on the linux server and it says:
afptcpd [7214]:[error] zOpen on volume xxx:\failed
afptcpd [7214]:[error] zOpen on volume xxx:\failed

I would appreciate it if someone can advise where I should look into to
troubleshoot this issue.

Thank you very much!