Oracle Error Message
ORA-28544: connect to agent failed, probable Net8 administration error
Reason for the Error
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.
Solution
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 sevice ‘extproc_connection_data’ does NOT contain (HS=), or that the service definition used by a Heterogeneous Services database link DOES contain (HS=).
