The Network Adapter could not establish the connection

I am getting this error from a 3rd party application.


Create DbPool error: DatabasePoolWrapper error :DATABASEPOOL : JDBC DB
connection error : jdbc:oracle:thin:@10.20.66.154:1521:mysid ==> Io
exception:
The Network Adapter could not establish the connection

Any ideas what the problem might be?
Environment is Oracle 9.2 on Solaris 8.

Is there any way I can test a jdbc connection from the command line?

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