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Have a look at your tnsnames.ora / sqlnet.ora: http://ora-12222.ora-code.com/
Did you configure them properly?
Also please indicate your complete version numbers for forms and the database; if you are not on the latest patchlevel for forms 6i then you won't be able to connect to a 11g database of any version (let aside it isn't certified).
after installation from forms 6i not able to connect to oracle 10g databaseWindows... :-)
Forms 11g installation sets its environment, and now forms 6i points to the wrong tnsnames.ora.
The first thing you can try is copying tnsnames.ora from forms 6i Home to forms 11g Home (after saving this one, if necessary).