An error occurred while attempting to establish an Applications File Server connection

Anand Reddy reported this error:

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

This error comes when tnsnames.ora entries are missing from 806 home on web tier.  When you are clicking View Log or View Output, the tnsnames.ora of 806 home on web tier is used to connect to FNDFS_* listener on concurrent tier.  

After ensuring that the missing FNDFS_  entries were present in the $TNS_ADMIN/tnsnames.ora of 806 ORACLE_HOME on web server, it worked fine.