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ORA-28544: connect to agent failed, probable Net8 administration error

Oracle Database Tips by Donald BurlesonApril 13, 2016

Question: I am getting the ORA-28544 error with a database link to MS access:
ORA-28544: connect to agent failed, probable Net8 administration error
What is the solution fix for the ORA-28544 error?
Answer:  The oerr utility shows this for the ORA-28544 error:

ORA-28544: connect to agent failed, probable Net8 administration error
Cause: Net8 reported a failure to make a RSLV connection or a protocol mode error when the Oracle server attempted to establish communication with a Heterogeneous Services agent or an external procedure agent. This usually is due to an administration error in setting up Net8 service definitions in TNSNAMES.ORA or LISTENER.ORA: A basic network connection is opened, but it connects to a program which does not use the appropriate protocol. This often is a sign that the connection goes to the wrong program.
Action: Check Net8 administration in the following ways:
-- When using TNSNAMES.ORA or an Oracle Names server, make sure that the connection from the ORACLE server uses the correct service name or SID.
-- Check LISTENER.ORA on the agent's host machine to assure that the service name or SID refers to the correct agent executable in its (PROGRAM=...) clause.
-- Confirm in TNSNAMES.ORA or the equivalent service definition that service 'extproc_connection_data' does NOT contain (HS=), or that the service definition used by a Heterogeneous Services database link DOES contain (HS=).



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