Listener weirdness?

While testing something else (10g listener, 9i database) I came across something that is stumping me. Tnsping works "everywhere", but sqlplus only works from certain drives. Or, I should say, it does not work from one drive.

Any/all links/ideas/commentary/explanations welcome.

Thanks,
-joe

Listener is 10.2.0.1.0 (OracleXE, if that matters) Database is 9.2.0.1 (EE, if that matters) C: is local (duh), U: and K: are mapped. All software installed locally on C:
Listener.log shows the successful connections but not the failures.

(On the U drive)

U:\>tnsping joe9test

TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 15-NOV-2007 10:03:43 Copyright (c) 1997, 2005, Oracle. All rights reserved.

Used parameter files:
C:\oraclexe\app\oracle\product\10.2.0\server\network\admin\sqlnet.ora

Used TNSNAMES adapter to resolve the alias Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = BIS6203.ICAT.COM)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED)
(SERVICE_NAME = joetest)))

OK (30 msec)

U:\>sqlplus system/joe_at_joe9test

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 15 10:03:56 2007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified

Enter user-name:
U:\>c:

(Over to the C drive)

C:\>sqlplus system/joe_at_joe9test

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 15 10:04:12 2007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.1.0 - Production

SQL> exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.1.0 - Production

(And now to the K drive)

C:\>K:

K:\>sqlplus system/joe_at_joe9test

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 15 10:04:20 2007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.1.0 - Production

SQL> exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.1.0 - Production

(Back to U and the failure happens)

K:\>U:

U:\>sqlplus system/joe_at_joe9test

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 15 10:04:25 2007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified

Enter user-name:
U:\>  

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