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Please check below steps.Hope your issue will be resolved.
1. Edit the /etc/hosts file and make the server info the first line in the file like the following:
# Do not remove the following line, or various programs
# that require network functionality will fail.
10.126.10.112 obiprod1.edu.com obiprod1
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
2. Save the changes.
3. Restart the mid tier services as follows:
- cd /ora_home/opmn/bin and run
- opmnctl stopall
- opmnctl startall
- opmnctl status - to verify all processes started successfully.
This is to do with network Firewall, make sure all the ports are open Ex: 9703,9704 this you can check using:- netstat -an
Also check what port your coreapplication is using and make sure all those ports also open. This is how you go to there
Goto microsoft ODBC connection for coreapplication_OHxxxxxxxx i.e. xxxxxxx is any number
click on configure
click Next if Clustered DSN is checked
see what is the port number below saved Login EX:9703 then make sure that port is open
Let me know if it fixes the problem.