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TNS:packet writer failure error in Log archive dest 2

Hi ,
in oracle 10g R2 logical standby dataguard
i am continuously finding an error at primary side database in LOG_ARCHIVE_DEST_2 parameter from yesterday morning
Error is -> ORA-12571: TNS:packet writer failure
primary & standby database db are well connected.
Tns ping is ok.
Ping is ok.

result of v$standby_log on standby server
Group Archived Status
4 Yes Active
5 NO Unassigned
6 NO Unassigned

Standby Alert.log

-- Connected User is Valid
RFS[6281]: Assigned to RFS process 2844
RFS[6281]: Identified database type as 'logical standby'
Fri Jan 06 15:41:02 2012
RFS LogMiner: Client enabled and ready for notification
Fri Jan 06 15:41:02 2012
Redo Shipping Client Connected as PUBLIC

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