.net – COM class factory error

I had the same error when I deployed my app. I've got solution from this site: Component with CLSID XXX failed due to the following error: 80070005 Access is denied

Here is this solution:

1. In DCOMCNFG, right click on the My Computer and select properties.

2. Choose the COM Securities tab.

3. In Access Permissions, click Edit Defaults and add Network Service to it and give it Allow local access permission. Do the same for < Machine_name >\Users.

4. In Launch and Activation Permissions, click Edit Defaults and add Network Service to it and give it Local launch and Local Activation permission. Do the same for < Machine_name >\Users.

*I used forms authentication.

The first answer above is the correct answer. You cannot run a CPU ANY target application on 64 bit Windows if you reference a 32 bit COM component. It will not load.

What is happening is that the JIT is seeing CPU ANY and promoting your App to 64 bit. But there is no 64 bit version of the com control and hence you get the not registered error.

This is a big problem for people who use Microsoft Access for their database. There is no 64 bit version of Access, so when they see the error they think they need a 64 bit runtime (doesn't exist). You have to flag your app as 32 bit only in order to use the Access runtime.

This is a poor choice (IMHO) - find a better component that has a 64 bit version, or go 100% managed code.

I don't like to every tag apps as 32 bit only unless they REALLY need it.