Create a databse link to oracle 11g database

Hi All,
I have installed oracle 10g express edition n Apex 4.0.2 verion.
Now i want to connect 11g database to Apex. When i try to connect,
it prompts me an error saying;
Error Testing Database Link.
ORA-01017: invalid username/password; logon denied ORA-02063: preceding line from PRODSTDBY
And at the same time i can connect a 10g database successfully.. is this because of oracle db versioning issue ???
if yes, how can i able to overcome from this issue...????
please somebody help me to solve this......
Thanks in Advance,
Max

Telnet is not running on the server, I tried starting it, but it failed. When trying to connecting from my local machine through telnet, it is giving the following error:*Could not open connection to the host, on port 23: Connect failed*.
I am able to connect to the machine through SSH(putty).
Is there any other way to test if port 1521 is accepting connections?
Thanks,
Rajesh.

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    >
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    hi all, i need to install the oracle 11g database on my D drive but the check was failed where the check take place in C drive. Therefore, i just skipped it.
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