I have installed Oracle 8i Enterprise Edition on my Windows 2000 server machine. When I try to export my data, I am getting the error, "ORA-12560: TNS:Protocol adaptor error."
This is usually due to a setting in your sqlnet.ora. If you see a line in your sqlnet.ora file (located in ORACLE_HOMEnetworkadmin) like this:
then you should try commenting that line out and try again. If you don't see that line, try adding it and see if that changes your outcome.