EBS R12.2 adstpall.sh: Database connection could not be established. Either the database is down or the APPS credentials supplied are wrong

EBS R12.2 adstpall.sh: Database connection could not be established. Either the database is down or the APPS credentials supplied are wrong
If you are getting error like below even if listener at DB node is up.
adstrtal.sh: Database connection could not be established. Either the database is down or the APPS credentials supplied are wrong.

adstpall.sh: Database connection could not be established. Either the database is down or the APPS credentials supplied are wrong.

[applmgr@ebs122 scripts]$ adstrtal.sh

You are running adstrtal.sh version 120.24.12020000.6
Enter the APPS username: apps
Enter the APPS password:
Enter the WebLogic Server password:
adstrtal.sh: Database connection could not be established. Either the database is down or the APPS credentials supplied are wrong.

USAGE: adstrtal.sh [-skipNM] [-skipAdmin] [-nothreading]
adstrtal.sh -secureapps [-skipNM] [-skipAdmin]
adstrtal.sh -nodbchk [-skipNM] [-skipAdmin]

adstrtal.sh: exiting with status 1

or 
adstpall.sh: exiting with status 1

[applmgr@ebs122 scripts]$ cd $APPL_TOP
[applmgr@ebs122 appl]$ pwd
/apps01/applmgr/TEST/fs1/EBSapps/appl

[applmgr@ebs122 appl]$ cd $APPL_TOP
[applmgr@ebs122 appl]$ . ./APPSTEST_ebs122.env
[applmgr@ebs122 appl]$ cd $ADMIN_SCRIPTS_HOME
[applmgr@ebs122 scripts]$ adstrtal.sh
You are running adstpall.sh version 120.22.12020000.5
Enter the APPS username: apps
Enter the APPS password:
Enter the WebLogic Server password:
The logfile for this session is located at /apps01/applmgr/TEST/fs1/inst/apps/TEST_ebs122/logs/appl/admin/log/adstrtal.log