IIS & PHP Session

Hi, I have installed php on IIS as ISAPI module (with zend optimizer) .. but session stuffs. doesnt work.. giving this error message.. i have created /tmp folder in site and gived read , write etc.. rights but doesnt fix the problem.. do you have any idea ? thanx a lot.. Windows2000 / IIS 5 Php 4.0.6 Warning: open(/tmp\sess_99b4cf60616b1546a21acc6e0d9085d1, O_RDWR) failed: m (2) in Unknown on line 0 Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 Ertan This is session info session Session Support enabled Directive Local Value Master Value session.auto_start On On session.cache_expire 180 180 session.cache_limiter nocache nocache session.cookie_domain no value no value session.cookie_lifetime 0 0 session.cookie_path / / session.cookie_secure Off Off session.entropy_file no value no value session.entropy_length 0 0 session.gc_maxlifetime 1440 1440 session.gc_probability 1 1 session.name PHPSESSID PHPSESSID session.referer_check no value no value session.save_handler files files session.save_path /tmp /tmp session.serialize_handler php php session.use_cookies on on