"new VpnApiClass()" get COM Exception 800701e7 till reboot

Question

I am using the CISCO COM object accessed via Interop.VpnApiLib in a C#, .NET2.0 project on Windows 8.1, 64 bit.

I create an instance of the class VpnApiClass from this library with the following line:

 vpnApiLib = new VpnApiClass();

Sometimes this line of code works, but too often, I get the following Exception:

Retrieving the COM class factory for component with CLSID {C15C0F4F-DDFB-4591-AD53-C9A71C9C15C0} failed due to the following error: 800701e7.

Only a Windows reboot helps in such a situation. I googled the error code, and found that it means

"Error: attempt to access invalid address"

Does anyone know what to do to get round this error?

Answer 1

Inspired by another bug regarding a similar issue here, we found a workaround. The DLL seems to have a fixed load address. When I load the DLL using LoadLibrary() right at program start, this address is free and ‘new VpnApiClass()’ works.