OpenDDS's DCPS Information Repository (DCPSInfoRepo) is a CORBA server. (OpenDDS currently uses CORBA as a discovery mechanism, but not for data distribution.) By default, DCPSInfoRepo will try to write its IOR (Interoperable Object Reference) to a file named "repo.ior" in the current working directory. You must have permission to write the file.
There is lots of information and examples about running DCPSInfoRepo in the OpenDDS Developer's Guide, available for free download from http://www.opendds.org/.
Also, to get timely help with OpenDDS, please join and use the OpenDDS mailing lists on Sourceforge.net's "opendds" project.