Oracle Solution for Error ora-28557

ORA-28557: unknown string for database link to non-Oracle system

What triggered the Error:

en attempting to connect to a non-Oracle system through a Heterogeneous Services database link, the agent supporting this non-Oracle system failed to return FDS_CLASS_NAME and/or FDS_INST_NAME. ORACLE requires these names to configure the heterogeneous database link.

What should we do to fix it:

ntact the DBA to check setup of the connection and the Heterogeneous Services agent.