Your error shouldn't have anything to do with the languages or character set in use since the error is a protocol adapter error. If you set your ORACLE_HOME, ORACLE_SID, and LOCAL environment variables properly, I've not usually had problems using exp on the server. You may also toggle the SQLNET.AUTHENTICATION_SERVICES parameter. If it is set, comment it out and if it is not set, set it to (NTS) and see if that changes your errors at all.
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