Some times when we make a concurrent request and try to view the log file after complition of request (may be completed normal or some error) from the concurrent manager form we get following type of error
An error occurred while attempting to establish an Applications File Server connection with the node FNDFS_(Your env_name)_(Your_Server_name). There may be a network configuration problem, or the TNS listener on node FNDFS_(Your env_name)_(Your_Server_name) may not be running. Please contact your system administrator.
In this case you need to set one profile which will fix this issue. You need to set the value for RRA: Service Prefix to FNDFS_(Your_Env_name)_.
This can be done using navigation Profiles –> system.