Some error of the Oracle connection TNS-03505 OR TNS-12541 (original)

connection|error|oracle| Original
(original) configuration Tnsname is a very easy problem, nothing to say, before also never missed, but today when the configuration of two small problems (these two problems are configured with the GUI will not come out, I think the Java startup is too slow, manual configuration Tnsname.ora appear)
C:\>tnsping 100

TNS Ping Utility for 32-bit windows:version 9.2.0.1.0-production on 15-oct-2004 12:38:38

Copyright (c) 1997 Oracle Corporation. All rights reserved.

Used parameter files:
F:\oracle\ora92\network\admin Qlnet.ora

Used HOSTNAME Adapter to resolve the alias
Attempting to Contacts (description= (Connect_data= (sid=*) (service_name=100)) (Address= (PROTOCOL=TCP) (HOST=100) (PORT =1521)))
Tns-12541:tns:no Listener
View server-side monitoring, lsnrctl status, results are normal

View Tnsname.ora
100 =
(DESCRIPTION =
(Address_list =
(address = (PROTOCOL = TCP) (HOST = 192.168.6.100) (PORT = 1521))
)
(Connect_data =
(SERVER = dedicated)
(service_name = Oracas)
)
)

Absolutely right ....
*******************************************************************
Or is
C:\>tnsping 226

TNS Ping Utility for 32-bit windows:version 9.2.0.1.0-production on 15-oct-2004 12:40:12

Copyright (c) 1997 Oracle Corporation. All rights reserved.

Used parameter files:
F:\oracle\ora92\network\admin Qlnet.ora

tns-03505:failed to resolve name (meaning there is no 226 in file Tnsname.ora)
View Tnsname.ora
DESCRIPTION = (=
(Address_list =
(address = (PROTOCOL = TCP) (HOST = 192.168.6.226) (PORT = 1521))
)
(Connect_data =
(service_name = Oracas)
)
)
Absolutely right ...

Finally, the reason for the above two problems is that there should be more than one space in the front of TNS ... Cold, incredibly is this kind of mistake ...
So when you configure it, be careful about the details.