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>I use IIS 3.0 on my server and ie 4.0 browser. I build my com object with option (single use and multi use) but it doesn't make deference. To make sure that the com object work fine, i made a lite fox exe that use this com object and i run it on the server and it work fine. Some people said check security of the anonymous user but i change the default user of Http login with the administration user login to make sure no security probleme and it doesn't change my error.

I didn't think you could change the internet user's impersonation account with IIS 3.0. (4.0 is different, but only for out of process servers) I believe all access is granted based on the right of the IUSR_ acount. Have you granted rights to that user account?