I would bet it has something to do with host naming. Try your IP address instead of the hostname in your tnsnames.ora. For example:
ateolq.world =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = tcp.world)
(PROTOCOL = TCP)
(Host = 127.1.1.101)
(Port = 1521)
)
(ADDRESS =
(COMMUNITY = tcp.world)
(PROTOCOL = TCP)
(Host = 127.1.1.101)
(Port = 1526)
)
)
(CONNECT_DATA = (SID = eolq)
)
)