Cannot connect to XE after following "How To" Windows XP Pro SP2

Question

Hi Sharon and everyone,
I have read all related posts, the how-to and tried many times including restarting XE but still cannot connect using SQL Developer. I already have a small schema created using ths SQL Window of XE and can connect using "Toolkit for Oracle" (though this behaves erratically and I don't like it so far). I have succesfully connected also using the XE ODBC Driver from MS Access and INSERTED Rows in a table in the Schema.
I want to use SQL Developer but I get the following message when trying to connect (this PC is Server and Client) :
"Status : Failure -Listener refused the connection with the following error:ORA-12505, TNS:listener does not know of SID given in connect descriptorThe Connection decriptor used by the client was:127.0.0.1:1521:xe"
Inputs used :
Username : system
Password : *******
Basic Tab :
Hostname: 127.0.0.1
Port: 1521
SID: XE
TNS TAB:
Network Alias: "XE" (this is the default and there is no mention in the How-To of overriding it at all ! )
If I change the Network Alias to "EXTPROC_CONNECTION_DATA" or "ORACLR_CONNECTION_DATA" I get the same message.
If I try using "Service Name" instead of "SID" I get a similar message but with "does not currently know of service requested". ( All 3 Network Alias values tried)
Please can you help me ?

Answer 1

Hallo Sue,
Thanks for a prompt reply. It helps to know that the Basic and TNS (and I presume also the "Advanced") Tabs are mutually exclusive.
This does not however solve my problem as when I enter the SID "XE" in the Basic Tab I get the error :
"Status : Failure -E/A Exception :Connection reset" the first time I click on "Test".
If I then click on "Test" a second time I get "Status : Failure -E/A Exception :Connection reset by peer: socket write error "
The 3rd time I get :
"Status : Failure -E/A Exception :Connection reset" the first time I click on "Test".
The 4th time I get :
"Status : Failure -Listener refused the connection with the following error: ORA-12505, TNS:listener does not currently know of SID given in connect descriptorThe Connection descriptor used by the client was:127.0.0.1:1521:xe"
If I check using lsnrctl status the listener is listening on port 1521 (protocol=tcp, host = swisspair2).
A further problem I have had since installing XE which may be related to this problem is that I cannot start the Database Home Page (despite reading all threads similar on the XE Forum I can't resolve this either). The error I get when trying to start the Database Home Page is "The connection was refused when trying to connect to 127.0.0.1:8080"
Could you suggest any problems that I may have on this "Server/Client" PC (Windows XP Professional SP2)