DB Links pointing to  sql server not working

Hi,
We created a db link to fetch data from sql server we are getting the following error
Link : "APPS_EDW_WALT.WORLD"
Error : ORA-28545: error diagnosed by Net8 when connecting to an agent
Unable to retrieve text of NETWORK/NCR message 65535
ORA-02063: preceding 2 lines from APPS_EDW_WALT
Please let us know how to resolve the same.
praavan

Hi Praavan,
Please provide Oracle and OS versions.
ORA-28545: error diagnosed by Net8 when connecting to an agent
Cause: An attempt to call an external procedure or to issue SQL to a non-Oracle system on a Heterogeneous Services database link failed at connection initialization. The error diagnosed by Net8 NCR software is reported separately.
Action: Refer to the Net8 NCRO error message. If this isn't clear, check connection administrative setup in tnsnames.ora and listener.ora for the service associated with the Heterogeneous Services database link being used, or with 'extproc_connection_data' for an external procedure call.Please refer to following links:
ORA-28545: error diagnosed by Net8 when connecting to an agent error URGENT
http://dbaforums.org/oracle/index.php?showtopic=6684
HTH,
Thierry

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