Custom Exceptions in Remoting

Hi!
I'm developing an application that uses remoting. I used to use the .config
file and RemotingConfiguration.Configure() to configure my server, but now
I'm asked to save everithing on the registry. I've been able to migrate
everything but the custom error attribute in the .config file. I have
written my own Exception (which inherits from System.Exception). It is
serializable and works great when I add the in the .config file, but when I
register everything programatically I get an exception in the client asking
me to add that tag. Is there any way to do that by code?

Thanks in advance,

Matias

PS: if needed I can post the server code.