ORA-12571: TNS: packet writer failure

tie xu <[email protected]>
Newsgroups gmane.comp.db.oracle.toad.free
Message-ID <[email protected]> 
Hi, group,
 
I just updated Toad for Oracle from version 9.5 to 10.6. As I connected to the database and expanded Users list, user name shown the wired characters with the error message: ORA-12571:TNS: packet writer failure. 
 
Any solution to fix this issue is appreciated.
 
Thanks.
 
TX
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