Oracle database - connection request timed out - after client windows joins a domain on server 2012

Question

I have a total of 3 systems, all installed on the Oracle Virtual box.

A: Windows 7 64 bit - Oracle database 11g R2 installed
B: Windows 7 64 bit - Used for testing developed application
C: Windows Server 2012 R2 Datacenter Edition - as a domain controller

Initially, I had only two systems, A and B, and the application on system B was able to connect to oracle database on system A.

After I installed system C on another Virtual Machine in VirtualBox and created it as a domain controller, and had the systems A and B join the new domain created, I am not able to connect to the oracle database on system A.

The error I was getting was: Connection request timed out - I checked on system A and database was stopped. I tried login using sqlplus and it failed with the 'No listener running', and I used the lsnrctl start to start the listener.

Then, I was able to connect using sqlplus on system A.

But, still the application on system B can't connect to database and receives - Connection time out .

I have checked the accessibility issues, system A is visible and accessible from system B and I get a proper ping request reply entries.

Can some one help me to figure out the issue?

Answer 1

I have resolved this. The problem was that, on system A, the firewall had to be turned off separately for the domain. It was already off for the Public Network and Home Network , but it had be turned off third time again for the Domain Network .