why can't i upload files iis?

[ljzhu]

when i use Apche,i can upload files successfully,but once used iis ,there is alway error.

[Narcissus]

I'm just going to take a stab in the dark and say that this could be related to IIS permissions. Make sure that the directory where PHP / IIS is attempting to store the uploaded file (it needs somewhere temporary to store it while it's being uploaded) is actually writable by the IIS user.

Does IIS have any logs that mention permissions lacking?