An error occurred while attempting to establish an Applications File Server connection with the node FNDFS_linga_hostname. There may be a network configuration problem, or the TNS listener on node FNDFS_linga_hostname may not be running. Please contact your system administrator.

Error Message: 

Encountered below error while opening Concurrent request log/out file.

An error occurred while attempting to establish an Applications File Server connection with the node FNDFS_linga_hostname. There may be a network configuration problem, or the TNS listener on node FNDFS_linga_hostname may not be running. Please contact your system administrator.

Solution:

==> Added tns entry in MT node to fix the issue 

FNDFS_linga_hostname=

        (DESCRIPTION=

                (ADDRESS=(PROTOCOL=tcp)(HOST=hostname.domain.com)(PORT=10911))

            (CONNECT_DATA=

                (SID=FNDFS)

            )

        )