Win98, 8i pers.edition (SID=ORCL) and 6i Dev
(ADDRESS = (PROTOCOL = BEQ)
(PROGRAM = oracle80)
(ARGV0 = oracle80ORCL)
(ARGS = '(DESCRIPTION=(LOCAL=YES)
(CONNECT_DATA = (SID = ORCL))
but I get ORA-12174: TNS can't resolve service name
when I try system/manager with connect string "po8"
on sqlplus, same problem with Form Builder
Find all of the tnsnames.ora files on your server and make sure they are the same.
You can ignore the ones in "Sample" folders.