Accessing public folders from internet

[Russ Jester]

I am trying to post an anonymous message to a public folder from the internet using active server pages. When I submit the form, I get the following error.

Collaboration Data Objects error `80040111`
[Collaboration Data Objects - [MAPI_E_LOGON_FAILED(80040111)]]

I need to logon anonymously. This is part of the code that I have for logon.

bstrProfileInfo = "/o=" + bstrEnterprise + "/ou=" + bstrSite +_
"/cn=Configuration/cn=Servers/cn=" + bstrServer +_
vbLF + "anon" + vbLF + "anon"
Set objSession = Server.CreateObject("MAPI.Session")
objSession.Logon "", "", False, True, 0, True, bstrProfileInfo
Set objInfoStores = objSession.InfoStores

I am going through a firewall to get to the Exchange Server. I don`t have control over the configuration of the firewall. Could the settings in the firewall be causing my problems?

Thanks!